Seiko Cal. 6172 - 991

This Spring Drive model from 1977 features a 37mm Two-Tone case. Powered by the 6172 caliber with 17j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-9f08ef5792ae]

Also known as: Bullhead, Bellmatic

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

37mm

Case Thickness

12.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Blue Sunburst

Jewels

17j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1977

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