Current Production
Seiko 5 Sports
SEIKO SRPK31
MSRP
$350 USD
Verified Aug 18, 2026
Case diameter38 mm
Lug-to-lug44.2 mm
Thickness12.1 mm
Case materialStainless steel
CrystalHardlex crystal
Water resistance100 m
MovementAutomatic, Caliber 4R36, 21,600 vibrations per hour, 24 jewels, Power reserve: approximately 41 hours
Calibre4R36
Power reserve41 hours
DialIvory
Bracelet or strapStainless steel bracelet
Specifications as published by Seiko →
Last verified Aug 18, 2026