Seiko Cal. 6231 - 904

The Seiko 6231-904 represents an important milestone in Seiko's 1967 lineup. Powered by the 6231 caliber with 35j jewels beating at 36,000 bph, it delivers a 52 hours power reserve. [seikata-wm-f5507202005f]

Also known as: UFO

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

14.0mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

80m

Dial Color

Cream

Jewels

35j

Frequency

36,000 bph

Power Reserve

52 hours

Year

1967

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