DOXA SUB 300T Professional
840.10.351.10
- Case
- 42.5mm
- MSRP
- $2,190
- Movement
- Automatic
- Reserve
- 38h
VS
Building 1v1 comparison
Building 1v1 comparison
1v1 Watch Comparison
A focused side-by-side page for specs, fit, movement details, review notes, and enthusiast context.
840.10.351.10
SPB143
Pair Review
Built from the saved specs and wearability notes for these two watches, then weighed against enthusiast priorities like fit, movement quality, practicality, finishing, value, and collector appeal.
Where it wins
Collectors who want authentic vintage dive heritage and strong design identity
Where it wins
Buyers who want the most versatile everyday diver
Both watches use automatic movements, but they take very different approaches. The Seiko uses the 6R35 with a 70-hour power reserve, which is a meaningful advantage for practical ownership because it can sit off-wrist longer without stopping. The DOXA uses the ETA 2824-2, a well-known 4 Hz movement with a 38-hour reserve; it is a proven workhorse, but the shorter reserve is less convenient. Listed data does not include accuracy claims or certification for either watch, so refinement and performance can only be judged indirectly: Seiko offers better autonomy, while DOXA offers a more traditional, familiar caliber architecture. Winner: Seiko Prospex SPB143
The Seiko measures 40.5mm wide, 13.2mm thick, 47.6mm lug-to-lug, and 180g, which gives it a compact, versatile profile with strong dive-watch presence that should suit a wide range of wrists. The pre-existing wearability notes emphasize that it wears exceptionally well for a diver, helped by the tapered bracelet and slim mid-case profile. The DOXA is larger at 42.5mm, slightly thicker at 13.65mm, and heavier at 194g, but its much shorter 44.5mm lug-to-lug and compact dial opening help it wear smaller than the raw diameter suggests. Its wearability notes highlight that it balances the wrist well and feels more compact than expected, though the overall impression is still more substantial and tool-like. If you want the easiest all-round fit, Seiko is the safer bet; if you like compact lug geometry with stronger wrist presence, DOXA is very appealing. Winner: Seiko Prospex SPB143
The Seiko has a sunburst grey dial with luminous markers and lume, sapphire crystal, a rotating bezel, 200m water resistance, date display, and a steel bracelet with a three-fold clasp and secure lock. Its strengths are subtle legibility, versatile styling, and strong everyday practicality; the 70-hour movement also helps as a daily watch. The DOXA counters with a vivid orange dial, Super-LumiNova, anti-reflective sapphire crystal, screw-down crown, helium escape valve, screw-down caseback, 1200m water resistance, a unidirectional bezel with no-decompression dive calculator, date display, and a beads-of-rice bracelet with micro adjustment. It is far more specialized and function-forward, with excellent dive credentials and stronger underwater-tool identity, but its bold dial and utilitarian scale make it less subdued for office or mixed daily wear. For sheer everyday versatility, Seiko is easier to integrate; for dive-focused functionality and standout visibility, DOXA is stronger. Winner: Seiko Prospex SPB143
At USD 1200, the Seiko delivers a highly coherent package with strong wearability, a 70-hour movement, sapphire crystal, 200m water resistance, and a design that feels broadly useful rather than niche. Its collection context and 62MAS-inspired lineage add collector appeal without pushing it into overly precious territory. The DOXA is priced at USD 2190 and brings more historical identity, a more distinctive design language, and serious professional-dive credentials, including a helium escape valve and extremely high stated water resistance. However, its movement is more basic on paper, and the overall ownership proposition is more about character and heritage than material refinement. If value is judged by versatility and what you get for the money, Seiko is stronger; if it is judged by distinctive heritage and cult appeal, DOXA has the stronger enthusiast story. Winner: Seiko Prospex SPB143