Seiko Cal. 7156 - 443

This Spring Drive model from 1975 features a 45mm Titanium case. With its 19mm lug width and 15.5mm profile, it sits comfortably on most wrists. [seikata-wm-a0dfaeac86d1]

Also known as: Sumo, World Timer

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

45mm

Case Thickness

15.5mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Green

Jewels

32j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1975

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