Seiko Cal. 6681 - 557

This Kinetic model from 1981 features a 37mm Stainless Steel case. Powered by the 6681 caliber with 31j jewels beating at 36,000 bph, it delivers a 55 hours power reserve. [seikata-wm-55371c56ffbb]

Also known as: Monster, Navigator

Specifications

Movement

Kinetic

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

13.7mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Cream

Jewels

31j

Frequency

36,000 bph

Power Reserve

55 hours

Year

1981

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