Seiko Cal. 6640 - 171

This Hand-Winding model from 1977 features a 39mm Two-Tone case. With its 18mm lug width and 13.6mm profile, it sits comfortably on most wrists. [seikata-wm-a44591fc979c]

Also known as: Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.6mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

30m

Dial Color

White

Jewels

35j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1977

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