Seiko Cal. 6631 - 747

The Seiko 6631-747 represents an important milestone in Seiko's 1994 lineup. Powered by the 6631 caliber with 28j jewels beating at 28,800 bph, it delivers a 38 hours power reserve. [seikata-wm-c7dd1ddc01b0]

Also known as: Tuna, Goldfeather

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

44mm

Case Thickness

13.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

120m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

38 hours

Year

1994

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