Seiko Cal. 5641 - 639

The 5641-639 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5641 caliber with 32j jewels beating at 21,600 bph, it delivers a 50 hours power reserve. [seikata-wm-86e5b37fe8b7]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Two-Tone

Case Width

39mm

Case Thickness

14.1mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

110m

Dial Color

Cream

Jewels

32j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1989

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