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The Seiko Prospex Speedtimer SSC813 is the best all-round alternative to the compact Citizen Tsuno: it keeps a 39 mm retro-sporting footprint while adding solar power, sapphire crystal and 10 bar water resistance. Choose the Citizen AN3660-81A if the unusual Bullhead layout is the priority, the Citizen Promaster TSUNO CHRONO AV0104-06W if you want a larger premium Eco-Drive edition, or the Bulova Lunar Pilot 96A225 if you prefer a 45 mm case and high-precision quartz. These watches share a 1970s racing-watch attitude, but they differ sharply in size, crystal, power system, timing range and water rating.
Which watch is the best Citizen Tsuno alternative?
For most buyers, the Seiko Prospex Speedtimer SSC813 is the strongest substitute. Its 39.0 mm steel case is close to the 38.0 mm Citizen AN3660-81A, while its V192 solar movement, curved sapphire crystal, tachymeter and 10 bar water resistance make it easier to live with every day than the battery-powered, mineral-crystal Tsuno.
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The right choice changes if a particular trait matters more than general balance:
- Closest compact Bullhead character: Citizen AN3660-81A.
- Compact solar chronograph with sapphire: Seiko SSC813.
- Large, premium Citizen heritage piece: Citizen AV0104-06W.
- Largest case and high-precision quartz: Bulova Lunar Pilot 96A225.
The two Citizen references should not be treated as the same watch. AN3660-81A is the compact 0510 battery-quartz model; AV0104-06W is a 2026, 44.5 mm E210 Eco-Drive limited edition with a substantially different specification.
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What is the Citizen Tsuno design based on?
Citizen traces the look to its 1973 Chronograph Challenge Timer, commonly associated with the Bullhead nickname. Citizen’s design archive explains that rotating the movement by 90 degrees moved the push button to 12 o’clock and produced the distinctive three-eye arrangement. The result is a chronograph whose visual identity comes from its top-mounted controls rather than from a conventional three-o’clock pusher layout.
Citizen describes the original concept as “A chronograph-equipped model that creates a distinctive character by rotating the movement by 90 degrees.” The modern AN3660 family updates that idea with retro color blocking while retaining the compact, top-pusher silhouette. The AV0104-06W also descends from the same Challenge Timer lineage, but its larger case, deep-green dial, brown leather band, gold-colored accents and domed glass create a more luxurious 1970s grand-touring interpretation.
How do the Citizen Tsuno, Seiko Speedtimer and Bulova Lunar Pilot compare?
The key differences are easiest to see in a specification table. Figures below come from the manufacturers’ published specifications; regional availability and pricing can change.
| Model | Case and thickness | Movement and power | Crystal | Water resistance | Chronograph specification | Design direction |
|---|---|---|---|---|---|---|
| Citizen AN3660-81A | 38.0 mm; 11.7 mm | 0510 battery quartz; approximately two-year battery life | Mineral | 5 bar | 1/1-second timing, up to 12 hours; date | Compact modernized 1973 Bullhead/Tsuno |
| Seiko Prospex Speedtimer SSC813 | 39.0 mm; 13.3 mm; 45.5 mm lug-to-lug | V192 solar; approximately six months on a full charge | Curved sapphire with inner anti-reflective coating | 10 bar | 1/5-second timing, up to 60 minutes; date, 24-hour hand and power-reserve indicator | Seiko 1960s–70s sporting-chronograph lineage |
| Citizen Promaster TSUNO CHRONO AV0104-06W | 44.5 mm; 15.3 mm | E210 Eco-Drive; approximately eight months on a full charge | Spherical sapphire | 20 bar | 1/5-second timing, up to 12 hours; 60-minute totaliser, alarm and flyback-style instant reset | Premium 1973 Challenge Timer with car-dashboard cues |
| Bulova Lunar Pilot 96A225 | 45 mm | Proprietary 262 kHz quartz | Sapphire | 50 m | Six-hand high-precision quartz chronograph | Space-watch heritage with a large modern case |
Why is the Seiko Prospex Speedtimer SSC813 the closest practical alternative?
The SSC813 matches the Tsuno’s compact wrist presence more closely than the larger Citizen AV0104-06W or Bulova Lunar Pilot. At 39.0 mm, it is only 1 mm wider than the 38.0 mm AN3660, although its 13.3 mm thickness is greater than the Tsuno’s 11.7 mm. Seiko lists a 45.5 mm lug-to-lug measurement, useful for judging how far the watch will extend across a smaller wrist.
Its V192 movement is solar-powered and runs for approximately six months when fully charged. That removes routine battery replacement and adds a power-reserve indicator, while the date and 24-hour hand provide information absent from a simple three-register racing display. The chronograph records in 1/5-second increments for up to 60 minutes, so it offers finer displayed resolution than the AN3660 but a shorter maximum timing span.
Durability is the SSC813’s clearest everyday advantage. Seiko specifies a curved sapphire crystal with inner anti-reflective coating and 10 bar water resistance. Sapphire is more scratch-resistant than the AN3660’s mineral crystal, and the higher stated water rating gives the Speedtimer a wider margin for ordinary wet conditions. The rating is still a specification, not permission to ignore the watch’s operating instructions or service requirements.
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When should you choose the Bulova Lunar Pilot 96A225?
Choose the Lunar Pilot when you want the most assertive wrist presence and a high-precision quartz movement rather than a compact racing chronograph. Bulova specifies a 45 mm stainless-steel case, proprietary 262 kHz quartz, six-hand chronograph, sapphire crystal, black NATO strap and 50 m water resistance.
At 45 mm, the Lunar Pilot is 7 mm wider than the AN3660 and 6 mm wider than the SSC813. That difference is immediately relevant on a small or medium wrist, especially because the available data does not provide a lug-to-lug measurement for this reference. Measure your wrist and, if possible, compare the stated case diameter with a watch you already find comfortable before ordering.
The 262 kHz designation identifies Bulova’s high-frequency quartz approach; it is not a mechanical movement. The watch’s appeal is precise quartz timing combined with sapphire and the Lunar Pilot’s space-watch narrative, not a Bullhead case or a solar power system. Its 50 m rating is expressed in metres rather than bar, so compare the manufacturer’s units carefully instead of assuming the figures describe identical testing language.
The Lunar Pilot is therefore a contrasting alternative, not a direct visual replacement. It suits a reader who likes the retro-instrument idea but wants a broad, unmistakable statement watch and accepts the fit implications of a 45 mm case.
Which Citizen Tsuno should you buy: AN3660-81A or AV0104-06W?
The AN3660-81A is the authentic compact choice. Its 38.0 mm stainless-steel case, 11.7 mm thickness and top-mounted pusher arrangement preserve the proportions that make the Tsuno distinctive. The 0510 battery-quartz calibre is rated to ±20 seconds per month, runs for approximately two years on a battery, and drives a 1/1-second chronograph measuring up to 12 hours.
Its limitations are equally clear: mineral crystal, 5 bar water resistance and no solar charging. Those are not defects if you want the original-style profile and a lower cost tier, but they matter if the watch will face frequent knocks, intense sunlight is unavailable, or you want to avoid periodic battery service.
The AV0104-06W is a different proposition. Citizen lists a 44.5 mm case, 15.3 mm thickness, E210 Eco-Drive movement, spherical sapphire crystal and 20 bar water resistance. It runs for approximately eight months on a full charge and measures to 1/5 second for up to 12 hours. A 60-minute totaliser, power-reserve display, alarm and flyback-style instant reset add functions not present on the compact AN3660.
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Citizen’s 2026 concept positions the AV0104-06W as a quartz chronograph designed to outperform mechanical chronographs while channeling the 1973 Challenge Timer. The deep-green dial, brown leather band, gold-colored accents, layered dashboard-like construction and domed glass are intended to evoke 1970s classic cars. The Japanese announcement lists a recommended retail price of ¥187,000 before tax and a world limited quantity of 5,000 pieces. Treat both price and availability as date- and region-sensitive.
How do the case sizes affect fit?
Case diameter is the fastest way to separate these watches, but thickness and lug reach also shape the experience. Only Seiko publishes a lug-to-lug figure in the supplied specifications, so the other models should not be assigned an estimated measurement.
| Case size | Model | What it means for fit |
|---|---|---|
| 38.0 mm | Citizen AN3660-81A | Smallest option and the closest to the original compact Tsuno presence. |
| 39.0 mm | Seiko SSC813 | Compact diameter with a stated 45.5 mm lug-to-lug; curved crystal and 13.3 mm thickness add visual height. |
| 44.5 mm | Citizen AV0104-06W | Large, thick premium case at 15.3 mm; choose for presence, not discreet wear. |
| 45 mm | Bulova Lunar Pilot 96A225 | Largest listed case; check wrist span and lug overhang before purchase. |
Wrist circumference alone does not guarantee a fit. A watch can have a moderate diameter but long lugs, or a large diameter with a shape that sits differently. Use the SSC813’s 45.5 mm lug-to-lug as a reference and compare the other cases in person or against a paper template where possible.
Which alternative has the best crystal and water resistance?
If scratch resistance and wet-weather security are priorities, the ranking is straightforward from the published specifications: AV0104-06W has spherical sapphire and 20 bar; SSC813 has curved sapphire and 10 bar; Lunar Pilot has sapphire and 50 m; AN3660 has mineral crystal and 5 bar.
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- SSC813: curved sapphire with inner anti-reflective coating and 10 bar. This is the best balance of compact size and upgraded external durability.
- AV0104-06W: spherical sapphire and 20 bar. It has the strongest bar rating here, alongside the largest and thickest case.
- Lunar Pilot 96A225: sapphire and 50 m. Bulova states the rating in metres, so keep the unit distinction visible when comparing it with bar-rated watches.
Water-resistance numbers describe the manufacturer’s rating, not a guarantee that every aged or damaged watch remains sealed. Crown, pusher and gasket condition can change after impact or servicing; follow the relevant manual and have seals checked when the manufacturer recommends it.
How do the chronograph functions differ?
These watches are not interchangeable timers. The Tsuno alternatives vary in resolution, maximum duration and extra indications.
Citizen AN3660-81A
The AN3660 measures in 1/1-second increments for up to 12 hours. It includes a date and uses the straightforward 0510 battery-quartz layout. This suits elapsed-time timing where a 1-second display is sufficient and a 12-hour range is more useful than a short race-lap scale.
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Seiko SSC813
The SSC813 displays 1/5-second timing for up to 60 minutes. Its date, 24-hour hand and power-reserve indicator make it more information-rich, but the one-hour chronograph range is shorter than both Citizen references.
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Citizen AV0104-06W
The premium TSUNO combines 1/5-second timing with a 12-hour range. It adds a 60-minute totaliser, alarm and a flyback-style instant reset, allowing a richer dashboard-like display and quicker reset behavior than the compact AN3660.
Bulova Lunar Pilot 96A225
Bulova describes the Lunar Pilot as a six-hand high-precision quartz chronograph. The supplied specification does not state a timing increment or maximum duration, so do not assume it matches either Citizen or Seiko’s figures.
How do solar, battery and high-precision quartz power systems compare?
The movement choice affects ownership more than the dial styling suggests.
- Replaceable battery — AN3660: approximately two years of battery life, with accuracy rated at ±20 seconds per month. Eventually the battery must be replaced, and water-resistance seals should be considered during service.
- Solar/Eco-Drive — SSC813 and AV0104-06W: Seiko states approximately six months of operation on a full charge for the V192; Citizen states approximately eight months for the E210. Both reduce routine battery changes, but they still depend on adequate light exposure and proper service over time.
- High-precision quartz — Lunar Pilot: Bulova specifies a proprietary 262 kHz quartz movement. The supplied listing does not state a battery-life figure, so availability of that number should not be inferred from the movement frequency.
Accuracy figures are not directly comparable across the group because Citizen publishes ±20 seconds per month for AN3660 and ±15 seconds per month for AV0104-06W, while the supplied SSC813 and Lunar Pilot specifications do not include a monthly accuracy figure. A missing figure is not evidence of worse or better performance.
Which watch best matches each type of retro-racing buyer?
For a small wrist and the original Bullhead silhouette
Pick the AN3660-81A. Its 38.0 mm case and top-mounted controls deliver the defining Tsuno look with the least visual bulk. Accept mineral crystal, 5 bar resistance and a battery-powered calibre as part of that choice.
For a compact daily wearer with minimal upkeep
Pick the SSC813. The 39.0 mm case stays close to the Tsuno’s footprint, while solar power, sapphire and 10 bar resistance address the practical compromises of the AN3660. Its conventional pusher layout is the price of that more mainstream construction.
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For a statement piece with Citizen provenance
Pick the AV0104-06W. The 44.5 mm by 15.3 mm case, spherical sapphire, 20 bar rating, 12-hour 1/5-second chronograph, alarm and limited 2026 production make it a premium interpretation rather than a compact reissue.
For a large, precise quartz instrument
Pick the Lunar Pilot 96A225. Its 45 mm case and 262 kHz movement make it the most assertive option. Confirm that your wrist can accommodate the size before choosing it over the smaller Seiko or Citizen.
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What should you check before buying?
- Confirm the exact reference. AN3660-81A and AV0104-06W have different cases, calibres, crystals and water ratings. A listing that says only “Tsuno” is incomplete.
- Measure case spread. Use 38.0 mm, 39.0 mm, 44.5 mm and 45 mm as the official diameter points. Include thickness, especially for the 15.3 mm AV0104-06W and 13.3 mm SSC813.
- Choose the power system deliberately. Decide whether a replaceable battery, solar charging or high-precision quartz best fits your routine.
- Match the chronograph range to the task. The AN3660 and AV0104-06W run to 12 hours; the SSC813 runs to 60 minutes; Bulova’s supplied specification does not state the duration.
- Check crystal and water rating. Mineral versus sapphire and 5 bar, 10 bar, 20 bar or 50 m are meaningful differences, but none replaces correct sealing and servicing.
- Verify regional price and stock. The ¥187,000 AV0104-06W figure is a Japanese recommended retail price before tax, and the 5,000-piece quantity is worldwide. Seller pricing, taxes, warranty terms and availability can vary by market and date.
- Inspect the warranty and service route. Confirm that the seller identifies the correct movement and provides support for the region where you will wear the watch.
Final verdict: which alternative should you buy?
The Seiko Prospex Speedtimer SSC813 is the best general recommendation because it combines the compact proportions retro-racing buyers usually want with solar power, curved sapphire and 10 bar resistance. It is not a Bullhead, but it is the most balanced substitute for everyday wear.
The Citizen AN3660-81A remains the choice for authentic Tsuno character in a 38 mm package. The Citizen AV0104-06W is the premium, larger-format answer, with Eco-Drive, sapphire, 20 bar resistance, extra chronograph functions and a 2026 limited-edition presentation. The Bulova Lunar Pilot 96A225 belongs on the shortlist only when its 45 mm size and high-precision quartz identity are advantages rather than obstacles.
Frequently Asked Questions
What does the 0510 number on the Citizen Tsuno mean?
0510 is the calibre designation for the AN3660-81A’s battery-powered quartz movement. It identifies the movement family, not the case diameter, dial color or production year.
Is the Bulova Lunar Pilot mechanical because it is a historic instrument watch?
No. The 96A225 uses a proprietary 262 kHz quartz movement. Its historical appeal comes from the Lunar Pilot story, while its regulation and operation are quartz-based.
Can a 5 bar watch be used for swimming?
The AN3660 is officially rated at 5 bar, but that number alone does not replace the manufacturer’s usage guidance. Water resistance can decline after impact, gasket aging or service, so consult the manual and confirm seal condition before deliberate water exposure.
Will the AV0104-06W always cost ¥187,000?
No. ¥187,000 is Citizen’s Japanese recommended retail price before tax for the 2026 announcement. Local taxes, currency conversion, allocation and retailer pricing can change the amount and availability in other regions.
Does solar charging make the SSC813 maintenance-free?
No. Solar power reduces routine battery changes, but the watch still contains a rechargeable power system, seals and a mechanical chronograph module that require manufacturer-recommended inspection and service over time.
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