Seiko Cal. 0771 - 633

This Spring Drive model from 1966 features a 42mm Hardlex-Coated Steel case. Powered by the 0771 caliber with 30j jewels beating at 21,600 bph, it delivers a 58 hours power reserve. [seikata-wm-2a303863c313]

Also known as: Sumo, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

12.5mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

160m

Dial Color

Cream

Jewels

30j

Frequency

21,600 bph

Power Reserve

58 hours

Year

1966

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