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Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallThe Seiko Prospex Marinemaster SLA077 and SLA079 are Marinemaster 1968 Heritage Diver’s Watches with matching core specifications. Seiko’s reviewed product information does not establish the exact visual difference between the references, so check the official model images before choosing based on dial or bezel appearance. Both are listed at US$2,900 in Seiko’s U.S. lineup.
Seiko Marinemaster SLA077 vs. SLA079: the short answer
| Feature | SLA077 | SLA079 |
|---|---|---|
| Model family | Prospex Marinemaster 1968 Heritage Diver’s Watch | Prospex Marinemaster 1968 Heritage Diver’s Watch |
| Movement | Caliber 8L35, automatic with manual winding | Caliber 8L35, automatic with manual winding |
| Case diameter | 42.6 mm | 42.6 mm |
| Thickness | 13.4 mm | 13.4 mm |
| Lug-to-lug | 49.3 mm | 49.3 mm |
| Lug width | 20 mm | 20 mm |
| Water resistance | 300 m / 1,000 ft diver’s | 300 m / 1,000 ft diver’s |
| U.S. lineup price | US$2,900 | US$2,900 |
The researched specifications reveal no meaningful technical advantage for either reference. Compare Seiko’s official product images for their appearance, and make the practical choice based on the specific design you prefer, fit, and seller terms.
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What are the SLA077 and SLA079?
Seiko identifies both as Marinemaster 1968 Heritage Diver’s Watches, reinterpreting the design of its 1968 diver. The shared product information describes a modern diver’s watch rather than a claim that the contemporary models reproduce every specification of the historic watch.
Seiko describes design elements including a mirror-finished case surface, improved knurling on the bezel and crown, dual-curved sapphire crystal with an inner anti-reflective coating, and LumiBrite. These are manufacturer descriptions, not independent test results. Seiko also says the crown is locked into a separate component integrated into the case, making it easier to replace; that should be understood as Seiko’s design claim.
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- WATER-RESISTANT: these water-resistant men's dive watches are ISO scuba-approved to depths of 200 meters
- AUTOMATIC: these self-winding, automatic men's watches are powered by your movement, with a power reserve of 41 hours
- STAINLESS STEEL: features a durable 43.8mm stainless steel watch case and bracelet.
- LUMIBRITE DISPLAY: this men's automatic watch features a highly-legible display with LumiBrite hands and markers
- 4R35 CALIBER: equipped with the reliable caliber 4R35 automatic movement, this accurate men's watch keeps precise time
Specifications shared by both watches
Case, fit, and strap width
| Specification | Both references |
|---|---|
| Case diameter | 42.6 mm |
| Thickness | 13.4 mm |
| Lug-to-lug | 49.3 mm |
| Lug width | 20 mm |
These dimensions describe a substantial watch. The lug-to-lug measurement may help you assess fit, but dimensions alone cannot determine how a watch will sit on your wrist. Try it on if possible, especially if case size or thickness is a concern.
The 20 mm lug width gives you a starting point for researching alternate straps, not a guarantee that any 20 mm strap or end link will fit. Check the specific strap’s fit and clearance before purchasing.
Movement
Both references use Seiko Caliber 8L35, an automatic movement with manual winding. Seiko lists a power reserve of approximately 50 hours and precision of +15 to -10 seconds per day for each. These are manufacturer specifications, not independent measurements of an individual watch’s performance.
Water resistance and construction
Seiko rates both watches at 300 m / 1,000 ft diver’s water resistance. The rating is a manufacturer specification, not proof of the condition of a particular watch. Water resistance can depend on the watch’s condition and service history; consult Seiko or a qualified service provider before relying on it for water use.
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- Stainless Steel case with Black Resin Band
- Black Dial with date window at 3 O'clock
- Luminous markers and hour hands; sweep second hand
- Anti-reverse bezel
- Water-resistant to 200 M (660 feet)
What actually changes between the references?
The reviewed source text confirms that SLA077 and SLA079 are separate references in the same model family, but it does not specify their exact dial or bezel color and finish differences. Avoid relying on an unverified color description: compare the official product images for each reference before deciding which appearance you prefer.
The specifications reviewed here do not show a movement, dimension, water-resistance, or listed-price difference. There is no evidence in this source set that one reference performs better than the other.
Price and availability
Seiko’s U.S. Marinemaster lineup lists each reference at US$2,900. This is an official U.S. lineup price, not a guaranteed transaction price; regional prices, availability, and retailer offers can vary. Check the exact reference, seller, condition, and warranty terms before buying.
Which one should you buy?
| Your priority | What to do |
|---|---|
| Choosing by appearance | Compare the official images for SLA077 and SLA079; the researched text does not verify the precise visual distinction. |
| Matching technical specifications | Either reference; the reviewed core specifications match. |
| Checking wrist fit | Try the watch on and consider its 42.6 mm diameter, 13.4 mm thickness, and 49.3 mm lug-to-lug span. |
| Buying at the listed U.S. price | Use US$2,900 as Seiko’s lineup listing, then check current retailer terms and availability. |
Do not pay more on the assumption that one reference has a better movement or other technical advantage; none is documented in the reviewed specifications.
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- STAINLESS STEEL CASE built to endure with style, making this watch your perfect daily companion
- AUTOMATIC MOVEMENT for seamless precision in every tick of this watch
- SCRATCH-RESISTANT CRYSTAL to maintain a pristine look even with daily wear and tear on your watch
- LUMINESCENT HANDS for effortless readability in low-light conditions, ensuring you never miss a moment with this watch
- WATER RESISTANT DESIGN ensuring your watch is ready for any adventure, rain or shine
FAQ
Are the Seiko SLA077 and SLA079 different mechanically?
No mechanical difference appears in the reviewed Seiko specifications. Both use Caliber 8L35 and share the listed core dimensions, water-resistance rating, and movement specifications.
What is the visual difference between the SLA077 and SLA079?
The research reviewed for this comparison does not verify the precise dial or bezel difference. Check Seiko’s official images for both references rather than relying on an unconfirmed color description.
Do the SLA077 and SLA079 have the same price?
Seiko’s U.S. lineup lists both at US$2,900. Retail offers, regional pricing, and availability may differ.
Can I use a 20 mm strap on either watch?
Seiko lists a 20 mm lug width for both. That measurement is a useful starting point, but confirm the fit, clearance, and end-link compatibility of any specific strap.
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Is the 300 m rating an independent test result?
No. It is Seiko’s stated water-resistance specification. It does not establish the condition of an individual watch or replace appropriate servicing.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
