Seiko Cal. 6637 - 648

The Seiko 6637-648 represents an important milestone in Seiko's 1996 lineup. Powered by the 6637 caliber with 36j jewels beating at 21,600 bph, it delivers a 72 hours power reserve. [seikata-wm-1bf3ee459b94]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

37mm

Case Thickness

15.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

72 hours

Year

1996

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