Seiko Cal. 6637 - 818

The Seiko 6637-818 represents an important milestone in Seiko's 1977 lineup. Powered by the 6637 caliber with 36j jewels beating at 21,600 bph, it delivers a 48 hours power reserve. [seikata-wm-3a39370bdddc]

Also known as: UFO, Navigator

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

13.7mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

80m

Dial Color

Black

Jewels

36j

Frequency

21,600 bph

Power Reserve

48 hours

Year

1977

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