Seiko Cal. 6631 - 736

The Seiko 6631-736 represents an important milestone in Seiko's 1979 lineup. Powered by the 6631 caliber with 28j jewels beating at 21,600 bph, it delivers a 68 hours power reserve. [seikata-wm-f4c31dcadbee]

Also known as: UFO, Bellmatic

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

45mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

170m

Dial Color

Green

Jewels

28j

Frequency

21,600 bph

Power Reserve

68 hours

Year

1979

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