Seiko Cal. 0770 - 578

This Spring Drive model from 1969 features a 42mm Hardlex-Coated Steel case. It features a Black dial protected by a Hardlex crystal and offers 50m of water resistance. [seikata-wm-ac56ee2a5361]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1969

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