Seiko Cal. 7131 - 437

This Hand-Winding model from 1975 features a 35mm Hardlex-Coated Steel case. Powered by the 7131 caliber with 17j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-a3a7eb0bbd67]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

11.5mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

90m

Dial Color

Silver

Jewels

17j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1975

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