Seiko Cal. 6638 - 327

This Hand-Winding model from 1966 features a 43mm Hardlex-Coated Steel case. Powered by the 6638 caliber with 20j jewels beating at 36,000 bph, it delivers a 43 hours power reserve. [seikata-wm-7c1d4213b9d5]

Also known as: Bellmatic, World Timer

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

8.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

40m

Dial Color

Silver

Jewels

20j

Frequency

36,000 bph

Power Reserve

43 hours

Year

1966

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