Seiko Cal. 5646 - 401

This Spring Drive model from 1972 features a 40mm PVD Black case. With its 21mm lug width and 10.6mm profile, it sits comfortably on most wrists. [seikata-wm-460b84874a1a]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

40mm

Case Thickness

10.6mm

Lug Width

21mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

60m

Dial Color

White

Jewels

17j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1972

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