Seiko Cal. 6637 - 997

The Seiko 6637-997 represents an important milestone in Seiko's 1980 lineup. The Rotating bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-ed4dd745acd9]

Also known as: Sumo, Sportsmatic

Specifications

Movement

Kinetic

Case Material

Two-Tone

Case Width

39mm

Case Thickness

8.9mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

50m

Dial Color

Burgundy

Jewels

33j

Frequency

28,800 bph

Power Reserve

64 hours

Year

1980

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