Seiko Cal. 5637 - 777

The Seiko 5637-777 represents an important milestone in Seiko's 1981 lineup. The Rotating bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-45294402fd0c]

Also known as: Bullhead, Silverwave

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

34mm

Case Thickness

9.1mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

160m

Dial Color

Navy

Jewels

32j

Frequency

36,000 bph

Power Reserve

60 hours

Year

1981

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