Seiko Cal. 5661 - 564

This Spring Drive model from 1977 features a 38mm Stainless Steel case. With its 18mm lug width and 14.7mm profile, it sits comfortably on most wrists. [seikata-wm-1948d2b2c414]

Also known as: Sumo, Helmet

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

14.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Burgundy

Jewels

25j

Frequency

36,000 bph

Power Reserve

40 hours

Year

1977

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