Seiko Cal. 7172 - 657

This Spring Drive model from 1987 features a 37mm PVD Black case. Powered by the 7172 caliber with 27j jewels beating at 28,800 bph, it delivers a 65 hours power reserve. [seikata-wm-7a07f677cf98]

Also known as: Sumo, Baby Tuna

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

65 hours

Year

1987

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