Seiko Cal. 4437 - 728

This Spring Drive model from 1976 features a 36mm PVD Black case. With its 19mm lug width and 10.7mm profile, it sits comfortably on most wrists. [seikata-wm-bdb374c5d8a5]

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

10.7mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

160m

Dial Color

Silver

Jewels

33j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1976

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