Seiko Cal. 7031 - 901

This Hand-Winding model from 1980 features a 37mm Stainless Steel case. It features a Black dial protected by a Mineral crystal and offers 40m of water resistance. [seikata-wm-96904fe6be0c]

Also known as: Helmet, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

8.9mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

40m

Dial Color

Black

Jewels

24j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1980

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