Seiko Cal. 6637 - 678

This Hand-Winding model from 1985 features a 43mm Stainless Steel case. With its 18mm lug width and 13.6mm profile, it sits comfortably on most wrists. [seikata-wm-1fcfaacf90b2]

Also known as: World Timer

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

43mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Silver

Jewels

32j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1985

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