Prospex 1970 Diver's Modern Re-interpretation
Ref. SPB317 · “Captain Willard”
- Case diameter
- 41 mm
- Manufacturer spec
- Lug-to-lug
- 46.9 mm
- Manufacturer spec
- Thickness
- 12.3 mm
- Manufacturer spec
- Lug width
- 20 mm
- Manufacturer spec
Retail price $900 (US, Oct 2026)
How the Prospex 1970 Diver's Modern Re-interpretation wears
Its lugs add 5.9 mm to the 41 mm case, close to the 7.1 mm typical across the almanac, so its diameter is a fair guide to how it wears.
On our fit model it sits best on wrists from 6.5" to 7.75" (16.5–19.7 cm); below 6.5" the lugs start to reach the edge of the wrist.
At 12.3 mm thick it is slimmer than 75% of the 79 other dive watches we've measured, so it slides under a cuff more easily than most.
Its 20 mm lug width is one of the most common strap sizes; 104 other watches here share it, so aftermarket straps are easy to find.
Will the Prospex 1970 Diver's Modern Re-interpretation fit your wrist?
With a 46.9 mm lug-to-lug, here is how it wears across common wrist sizes. We estimate the flat top of each wrist from its circumference; measure yours for a closer answer in the fit finder.
| Wrist | Flat width (est.) | Fit |
|---|---|---|
| 6" | 47.2 mm | Lugs overhang |
| 6.5" | 51.2 mm | Ideal fit |
| 7" | 55.1 mm | Ideal fit |
| 7.5" | 59.1 mm | Ideal fit |
| 8" | 63 mm | Wears small |
Specifications
- Reference
- SPB317
- Collection
- Prospex
- Status
- In production
- Case material
- stainless steel
- Crystal
- curved sapphire
- Water resistance
- 200 m
- Bezel
- unidirectional rotating 60-minute diver's bezel
- Dial
- black
- Strap / bracelet
- black silicone strap
- Weight
- 100 g
- Style
- Dive
Movement
- Caliber
- Seiko 6R35
- Type
- automatic
- Power reserve
- 70 hours
- Frequency
- 21,600 vph (3 Hz)
- Jewels
- 24
- Accuracy
- +25/-15 s/day
6 other watches use the Seiko 6R35
Takes 20 mm straps. See other 20 mm watches and straps.
More Prospex references
- SeikoProspex 1965 Diver's Modern Re-interpretationSPB143 · “62MAS reinterpretation”
- Case
- 40.5 mm
- Lug-to-lug
- 47.6 mm
- Thick
- 13.2 mm
- SeikoProspex AlpinistSPB507
- Case
- 39.5 mm
- Lug-to-lug
- 46.4 mm
- Thick
- 12.7 mm
- SeikoProspex AlpinistSPB503
- Case
- 39.5 mm
- Lug-to-lug
- 46.4 mm
- Thick
- 12.7 mm
- SeikoProspex AlpinistSPB121 · “Alpinist”
- Case
- 39.5 mm
- Lug-to-lug
- 46.4 mm
- Thick
- 13.2 mm
- SeikoProspex AlpinistSPB209
- Case
- 39.5 mm
- Lug-to-lug
- 46.4 mm
- Thick
- 13.2 mm
- SeikoProspex AlpinistSPB505
- Case
- 39.5 mm
- Lug-to-lug
- 46.4 mm
- Thick
- 12.7 mm
- SeikoProspex Diver SamuraiSRPB49 · “Samurai”
- Case
- 43.8 mm
- Lug-to-lug
- 48 mm
- Thick
- 13 mm
- SeikoProspex Diver's 200mSPB103 · “Sumo”
- Case
- 45 mm
- Lug-to-lug
- 52.6 mm
- Thick
- 12.9 mm
- SeikoProspex Diver's 200mSPB101 · “Sumo”
- Case
- 45 mm
- Lug-to-lug
- 52.6 mm
- Thick
- 12.9 mm
- SeikoProspex Land Mechanical 38mmSPB249
- Case
- 38 mm
- Lug-to-lug
- 46.2 mm
- Thick
- 12.9 mm
- SeikoProspex Sea TurtleSRPE93 · “Turtle”
- Case
- 45 mm
- Lug-to-lug
- 47.7 mm
- Thick
- 13.4 mm
- SeikoProspex Speedtimer MechanicalSPB513
- Case
- 39.5 mm
- Lug-to-lug
- 44.5 mm
- Thick
- 12 mm
- SeikoProspex Speedtimer Solar ChronographSSC911
- Case
- 41.4 mm
- Lug-to-lug
- 45.9 mm
- Thick
- 13 mm
- SeikoProspex Speedtimer Solar Chronograph 39mmSSC961
- Case
- 39 mm
- Lug-to-lug
- 45.5 mm
- Thick
- 13.3 mm
Watches that wear the same size
Other watches within 1.5 mm of its lug-to-lug.
- Grand SeikoElegance GMTSBGM221
- Case
- 39.5 mm
- Lug-to-lug
- 46.9 mm
- Thick
- 13.7 mm
- BalticAquascaphe Classic
- Case
- 39 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm
- BalticAquascaphe GMT MK II
- Case
- 39.5 mm
- Lug-to-lug
- 47 mm
- Thick
- 13.8 mm
- BalticAquascaphe MK2 39.5mm
- Case
- 39.5 mm
- Lug-to-lug
- 47 mm
- Thick
- 12.9 mm
- BalticBicompax 002
- Case
- 38 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm
- BalticHMS 002
- Case
- 38 mm
- Lug-to-lug
- 47 mm
- Thick
- 13 mm
Same 20 mm lug width
All 20 mm watchesThese take the same straps as the Prospex 1970 Diver's Modern Re-interpretation.
- BalticAquascaphe MK2 37mm
- Case
- 37 mm
- Lug-to-lug
- 45 mm
- Thick
- 12.9 mm
- BalticHermetique Tourer
- Case
- 37 mm
- Lug-to-lug
- 46 mm
- Thick
- 10.8 mm
- BalticMR Classic“MR01 successor”
- Case
- 36 mm
- Lug-to-lug
- 44 mm
- Thick
- 9.9 mm
- BrewMetric Chronograph Retro DialMETRIC-BLK
- Case
- 36 mm
- Lug-to-lug
- 41.5 mm
- Thick
- 10.8 mm
- BulovaLunar Pilot Chronograph 43.5mm98K112
- Case
- 43.5 mm
- Lug-to-lug
- —
- Thick
- —
- CertinaDS PH200M Powermatic 80C036.407.18.040.00
- Case
- 42.8 mm
- Lug-to-lug
- 52.1 mm
- Thick
- 11.9 mm