Seiko Cal. 6638 - 208

This Automatic model from 1974 features a 40mm Two-Tone case. Powered by the 6638 caliber with 18j jewels beating at 28,800 bph, it delivers a 37 hours power reserve. [seikata-wm-d8134f9fca7e]

Also known as: Bullhead, Helmet

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

15.3mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

30m

Dial Color

Green

Jewels

18j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1974

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