Seiko Cal. 6638 - 953

The Seiko 6638-953 represents an important milestone in Seiko's 1978 lineup. Powered by the 6638 caliber with 22j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-c9a9602bf42d]

Also known as: Rally, Bellmatic

Specifications

Movement

Kinetic

Case Material

PVD Black

Case Width

36mm

Case Thickness

13.5mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

40m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1978

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