Seiko Cal. 7121 - 664

This Hand-Winding model from 1971 features a 37mm Hardlex-Coated Steel case. The Fixed bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-dcdf39ada52e]

Also known as: Sumo, Emperor

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.3mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

60m

Dial Color

Green

Jewels

36j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1971

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