Seiko 5 Sports SRPK31
Ivory dial, 38.0 mm, 4R36 automatic.
- Japan: SBSA227
- 4R36
- 38.0 × 44.2 mm
- 100 m
- Hardlex
- $350
Specifications
- Movement
- Seiko 4R36, automatic with hand winding
- Accuracy
- +45 to -35 sec/day
- Case diameter
- 38.0 mm
- Lug-to-lug
- 44.2 mm
- Thickness
- 12.1 mm
- Lug width
- 20 mm
- Case
- Stainless steel
- Crystal
- Hardlex
- Water resistance
- 100 m
- Magnetic resistance
- 4,800 A/m
- Weight
- 140 g
- Band length (max)
- 205 mm
- Clasp
- Three-fold clasp with push button release
- Lume
- LumiBrite on hands and index(es)
- Dial
- Ivory
- Features
- See-through & Screw case back, Three-fold clasp with secure lock, Unidirectional rotating bezel
- Released
- 2023-03
- Series
- Seiko 5 Sports, SKX series
Same case, other dials
Identical case, movement and dimensions; only the dial, bezel or finish differs.
- SRPK29 JP SBSA225 Black · 38.0 mm · 4R36 $350
- SRPK33 JP SBSA229 Green · 38.0 mm · 4R36 $350
- SRPL77 JP SBSA299 Blue · 38.0 mm · 4R36 $350
- SRPL79 JP SBSA301 Gray · 38.0 mm · 4R36 $350
- SRPM07 JP SBSA321 Pink · 38.0 mm · 4R36 $450
- SRPK25 JP SBSA233 38.0 mm · 4R36 Discontinued
- SRPK35 JP SBSA231 Orange · 38.0 mm · 4R36 $325 Discontinued
- SRPL99 JP SBSA319 38.0 mm · 4R36 Discontinued
Other watches on the 4R36
Questions
What is the Japanese version of the Seiko SRPK31?
In Japan the SRPK31 is sold as the SBSA227: the same 4R36 calibre, the same 38.0 mm case and 100 m water resistance. Only the reference differs by market.
What movement is in the Seiko SRPK31?
The SRPK31 runs on the Seiko 4R36, an automatic movement that can also be wound by hand. See the 4R36 page for its specs and every watch built on it.
Does the Seiko SRPK31 have a sapphire crystal?
No. The SRPK31 has a Hardlex crystal. Hardlex is Seiko's hardened mineral glass: tougher than plain mineral glass, softer than sapphire.
How water resistant is the Seiko SRPK31?
100 m (10 bar). That covers swimming and snorkelling; it is not a certified diver's watch unless Seiko says so.
What is the lug width of the Seiko SRPK31?
20 mm. Any 20 mm strap fits.