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Both the Ianos Amfivios and Doxa Sub 300 Ti5 are titanium mechanical dive watches rated to 300 m, but they take different routes to get there. The Amfivios is narrower, longer from lug to lug, taller, and has the longer stated power reserve; the Ti5 is wider, shorter lug to lug, thinner, and its movement is COSC-certified. The choice turns on wrist fit, dial and bezel preferences, movement priorities, and whether the current price and availability work for you.
At a glance
| Specification | Ianos Amfivios | Doxa Sub 300 Ti5 |
|---|---|---|
| Case material | Grade 2 titanium | Grade 5 titanium |
| Case dimensions | 41 mm diameter; 49 mm lug to lug; 14.68 mm overall height | 42.5 mm diameter; 45 mm lug to lug; 13.4 mm thick |
| Movement | Automatic Sellita SW360-1; 31 jewels; 28,800 A/h (4 Hz); approximately 56-hour power reserve | Automatic Sellita SW200-1; 26 jewels; 28,800 vph (4 Hz); stated 38-hour power reserve; COSC-certified |
| Dial and date | Matte black, small seconds, date at 12 | Five dial treatments; date at 3 |
| Bezel | Unidirectional Grade 2 titanium bezel with 120 positions and luminous index | 60-minute/no-decompression bezel |
| Strap | Customized 20 mm rubber single-pass strap; fixed-bar integrated channel | 20 mm Dive Flex rubber strap, dial-matching or black, with titanium pin buckle |
| Stated water resistance | 300 m / 30 ATM | 300 m / 30 bar |
| Reported price | CHF 2,050 excluding taxes | €2,990 |
Dimensions, movement specifications, and stated water resistance come from the Ianos Amfivios product page and Fratello’s Amfivios coverage and Sub 300 Ti5 coverage. The cited prices are in different currencies, and the Ianos figure explicitly excludes taxes; without a dated conversion and matching tax treatment, they do not establish which watch costs less.
How do they fit on the wrist?
The Amfivios measures 41 mm across, 49 mm lug to lug, and 14.68 mm overall. Ianos also gives a 11.45 mm measurement from the top of the glass to the top of the strap channel, a distinct measurement that should not be confused with the watch’s overall height. Its smaller diameter may appeal to someone who prefers a less wide case, but the longer lug-to-lug span and taller overall profile matter just as much for fit.
The Ti5 is 42.5 mm across, 45 mm lug to lug, and 13.4 mm thick. It is wider than the Ianos but has a shorter lug-to-lug measurement and a lower stated thickness. Those proportions may suit a wrist that accommodates width but is less comfortable with long case ends or extra height. Neither diameter alone nor the titanium case material predicts how either watch will sit on a particular wrist; trying one on is the useful test.
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What do the titanium grades and construction mean?
Ianos specifies Grade 2 titanium for the Amfivios case and bezel; Doxa specifies Grade 5 titanium for the Ti5. Those are concrete material differences, but the cited specifications do not establish a controlled comparison of scratch resistance or overall durability. It would be misleading to declare one watch categorically tougher on that basis.
The Amfivios has a domed sapphire crystal with anti-reflective coating and a screw-down titanium crown. Its strap passes through an integrated channel with fixed bars. The Ti5 uses a box-type sapphire crystal with anti-reflective treatment and a screw-in Grade 5 titanium caseback. Both brands state 300 m water resistance—30 ATM for Ianos and 30 bar for Doxa—but that shared rating does not show that every other dive qualification is identical.
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How do the movements compare?
The Amfivios uses an automatic Sellita SW360-1 with 31 jewels, a frequency of 28,800 A/h (4 Hz), and approximately 56 hours of stated power reserve. Its longer reserve is the practical advantage if you take the watch off and want more time before it stops, though the cited figure is approximate.
Doxa specifies an automatic Sellita SW200-1 with 26 jewels, a frequency of 28,800 vph (4 Hz), and a 38-hour reserve. Doxa identifies it as COSC-certified. That certification is a meaningful distinction in how the movement is qualified, but the available specifications alone do not support a universal accuracy or reliability verdict against the Ianos.
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Which dial and bezel suit your preferences?
The Amfivios keeps to a matte-black dial with luminous markers, a date at 12, and a small-seconds subdial. That arrangement is visually distinctive among conventional dive-watch layouts; whether the date placement and subdial feel balanced is a matter of taste. Its unidirectional Grade 2 titanium bezel has 120 positions and a luminous index.
The Ti5 offers five dial treatments: orange Professional, black Sharkhunter, dark blue Caribbean, sunburst red Red Coral, and fully luminescent Whitepearl. It places the date at 3 and has a 60-minute/no-decompression bezel. Choose among these based on the color and display you actually want rather than treating the broader color selection as an objective performance advantage.
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Price and availability
Fratello reported the Amfivios at CHF 2,050 excluding taxes. Its coverage described an initial run of 100 numbered pieces delivered to existing clients, with 200 non-numbered pieces planned for the following weeks; it also said continued production depended on interest. Those launch details do not establish present stock or ongoing production, so check with Ianos for current availability.
Fratello reported the Ti5 at €2,990 and described it as a regular-production addition to the permanent Sub 300 collection, available through Doxa’s website and authorized retailers from September 2, 2026. Availability can change; confirm the current listing and regional terms with Doxa or an authorized retailer. The two cited prices should be weighed in their original currencies and applicable tax contexts rather than compared as if they were a like-for-like total.
Best Value
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Which one should you choose?
- Choose the Ianos Amfivios if the smaller diameter, black dial, date-at-12 and small-seconds layout, 120-position bezel, fixed-bar strap design, or approximately 56-hour reserve best matches your priorities—and its current availability and CHF price suit you.
- Choose the Doxa Sub 300 Ti5 if you prefer its shorter lug-to-lug and thinner case, a choice of five dial treatments, the 60-minute/no-decompression bezel, or a COSC-certified movement—and can accept the stated 38-hour reserve and its reported euro price.
- Before buying either, compare how the complete case dimensions sit on your wrist, decide which dial and bezel you will enjoy using, and verify current price, taxes, and stock in your region.
If considering another strap for the Amfivios, note that its specified 20 mm strap width is only part of the fit question. The integrated channel and fixed bars mean a generic 20 mm strap is not automatically compatible; confirm that the specific single-pass strap construction works with this case.
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.
