Seiko Cal. 6691 - 831

This Quartz model from 1987 features a 37mm Stainless Steel case. Powered by the 6691 caliber with 21j jewels beating at 28,800 bph, it delivers a 48 hours power reserve. [seikata-wm-d667e11edfd1]

Also known as: Sumo

Specifications

Movement

Quartz

Case Material

Stainless Steel

Case Width

37mm

Case Thickness

12.5mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

21j

Frequency

28,800 bph

Power Reserve

48 hours

Year

1987

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