Seiko Cal. 5657 - 731

This Hand-Winding model from 1988 features a 43mm Stainless Steel case. Powered by the 5657 caliber with 35j jewels beating at 21,600 bph, it delivers a 61 hours power reserve. [seikata-wm-6ded9e58f3c9]

Also known as: Sumo

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

14.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

35j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1988

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