Seiko Cal. 5641 - 901

The Seiko 5641-901 represents an important milestone in Seiko's 1988 lineup. With its 20mm lug width and 15.8mm profile, it sits comfortably on most wrists. [seikata-wm-71333d7b3641]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

43mm

Case Thickness

15.8mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Coin-Edge

Water Resistance

100m

Dial Color

Black

Jewels

32j

Frequency

21,600 bph

Power Reserve

44 hours

Year

1988

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