Seiko Cal. 6637 - 435

This Quartz model from 1978 features a 38mm Stainless Steel case. Powered by the 6637 caliber with 20j jewels beating at 28,800 bph, it delivers a 41 hours power reserve. [seikata-wm-21bb0464a6cd]

Also known as: Bellmatic, Golden Tuna

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

38mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

70m

Dial Color

White

Jewels

20j

Frequency

28,800 bph

Power Reserve

41 hours

Year

1978

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