Seiko Cal. 5657 - 631

Seiko 5657-631

The Seiko 5657-631 represents an important milestone in Seiko's 1983 lineup. Powered by the 5657 caliber with 18j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-fe8a63df3c0f]

Also known as: Sportsmatic

Specifications

Movement
Kinetic
Case Material
Two-Tone
Case Width
42mm
Case Thickness
15.3mm
Lug Width
22mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
50m
Dial Color
Champagne
Jewels
18j
Frequency
21,600 bph
Power Reserve
40 hours
Year
1983

Related Models

seikata-wm-fe8a63df3c0f