Seiko Cal. 6631 - 446

The Seiko 6631-446 represents an important milestone in Seiko's 1990 lineup. Powered by the 6631 caliber with 23j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-c5c0753876d4]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

42mm

Case Thickness

10.2mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

30m

Dial Color

Green

Jewels

23j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1990

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