Seiko Cal. 6637 - 421

This Hand-Winding model from 1965 features a 44mm Stainless Steel case. Powered by the 6637 caliber with 20j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-01a184a0cdf5]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

14.8mm

Lug Width

22mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

90m

Dial Color

White

Jewels

20j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1965

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