Seiko Cal. 6637 - 238

The Seiko 6637-238 represents an important milestone in Seiko's 1975 lineup. Powered by the 6637 caliber with 33j jewels beating at 36,000 bph, it delivers a 48 hours power reserve. [seikata-wm-bab8bf6c8584]

Also known as: Navigator, Emperor

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

8.5mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Champagne

Jewels

33j

Frequency

36,000 bph

Power Reserve

48 hours

Year

1975

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