Seiko Cal. 7131 - 778

The Seiko 7131-778 represents an important milestone in Seiko's 1972 lineup. Powered by the 7131 caliber with 34j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-d171e089bed7]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

14.0mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

70m

Dial Color

Black

Jewels

34j

Frequency

28,800 bph

Power Reserve

46 hours

Year

1972

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