Seiko Cal. 7131 - 977

The Seiko 7131-977 represents an important milestone in Seiko's 1965 lineup. Powered by the 7131 caliber with 22j jewels beating at 21,600 bph, it delivers a 71 hours power reserve. [seikata-wm-3ad25ad6e897]

Also known as: Sumo

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

8.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

50m

Dial Color

White

Jewels

22j

Frequency

21,600 bph

Power Reserve

71 hours

Year

1965

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