Seiko Cal. 6635 - 648

The Seiko 6635-648 represents an important milestone in Seiko's 1981 lineup. Powered by the 6635 caliber with 26j jewels beating at 28,800 bph, it delivers a 54 hours power reserve. [seikata-wm-b6b35d4f7aa3]

Also known as: Bellmatic, Sea Horse

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

9.9mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Burgundy

Jewels

26j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1981

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