Seiko Cal. 5640 - 124

This Spring Drive model from 1975 features a 41mm Stainless Steel case. It features a Cream dial protected by a Acrylic crystal and offers 190m of water resistance. [seikata-wm-f355bb9ef656]

Also known as: Sumo

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

41mm

Case Thickness

8.8mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

190m

Dial Color

Cream

Jewels

33j

Frequency

28,800 bph

Power Reserve

71 hours

Year

1975

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