Seiko Cal. 6638 - 977

The Seiko 6638-977 represents an important milestone in Seiko's 1977 lineup. Powered by the 6638 caliber with 32j jewels beating at 21,600 bph, it delivers a 47 hours power reserve. [seikata-wm-afc142e24b30]

Also known as: Pogue, World Timer

Specifications

Movement

Spring Drive

Case Material

Two-Tone

Case Width

39mm

Case Thickness

13.9mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

180m

Dial Color

Green

Jewels

32j

Frequency

21,600 bph

Power Reserve

47 hours

Year

1977

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