Seiko Cal. 5657 - 657

This Spring Drive model from 1985 features a 43mm Stainless Steel case. With its 22mm lug width and 10.2mm profile, it sits comfortably on most wrists. [seikata-wm-a27837babb5b]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

10.2mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

120m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1985

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