Seiko Cal. 6231 - 291

This Automatic model from 1969 features a 40mm Two-Tone case. Powered by the 6231 caliber with 18j jewels beating at 21,600 bph, it delivers a 44 hours power reserve. [seikata-wm-ae4e4dad07e9]

Also known as: Sumo

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

40mm

Case Thickness

9.8mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Black

Jewels

18j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1969

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