Seiko Cal. 4450 - 637

The Seiko 4450-637 represents an important milestone in Seiko's 1977 lineup. With its 19mm lug width and 12.4mm profile, it sits comfortably on most wrists. [seikata-wm-26fea355d637]

Also known as: Bullhead

Specifications

Movement

Quartz

Case Material

Two-Tone

Case Width

36mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Burgundy

Jewels

20j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1977

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