Seiko Cal. 6631 - 404

The Seiko 6631-404 represents an important milestone in Seiko's 1973 lineup. Powered by the 6631 caliber with 23j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-d6810f468f88]

Also known as: Crown

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

13.7mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

190m

Dial Color

Navy

Jewels

23j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1973

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