Seiko Cal. 6331 - 581

The Seiko 6331-581 represents an important milestone in Seiko's 1970 lineup. Powered by the 6331 caliber with 29j jewels beating at 28,800 bph, it delivers a 49 hours power reserve. [seikata-wm-8346c7c5de70]

Also known as: Sea Horse

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

40mm

Case Thickness

12.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

28,800 bph

Power Reserve

49 hours

Year

1970

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