Seiko Cal. 7131 - 813

This Hand-Winding model from 1972 features a 35mm Hardlex-Coated Steel case. The Coin-Edge bezel and 35mm case give it a distinctive presence on the wrist. [seikata-wm-44f3e83e12db]

Also known as: Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

14.6mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

200m

Dial Color

Navy

Jewels

28j

Frequency

36,000 bph

Power Reserve

54 hours

Year

1972

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