Seiko Cal. 5655 - 638

The Seiko 5655-638 represents an important milestone in Seiko's 1981 lineup. With its 21mm lug width and 13.3mm profile, it sits comfortably on most wrists. [seikata-wm-9f70473094c1]

Also known as: Bullhead, UFO

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

34mm

Case Thickness

13.3mm

Lug Width

21mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

19j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1981

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