Seiko Cal. 5657 - 531

Seiko 5657-531

This Hand-Winding model from 1978 features a 37mm Hardlex-Coated Steel case. The Coin-Edge bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-ce499c07cdca]

Also known as: Tuna, Sea Horse

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
37mm
Case Thickness
14.0mm
Lug Width
22mm
Crystal
Acrylic
Bezel
Coin-Edge
Water Resistance
100m
Dial Color
Green
Jewels
20j
Frequency
36,000 bph
Power Reserve
65 hours
Year
1978

Related Models

seikata-wm-ce499c07cdca