Seiko Cal. 4536 - 973

This Spring Drive model from 1968 features a 43mm PVD Black case. It features a Blue Sunburst dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-31af6dc67bf4]

Also known as: Sumo, Bullhead

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

43mm

Case Thickness

15.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

25j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1968

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