Seiko Cal. 7181 - 977

The Seiko 7181-977 represents an important milestone in Seiko's 1990 lineup. Powered by the 7181 caliber with 27j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-e68c1e79ff4d]

Also known as: Helmet

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

15.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Inner Rotating

Water Resistance

200m

Dial Color

White

Jewels

27j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1990

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