Seiko Cal. 6643 - 937

The 6643-937 is a sought-after Hand-Winding piece from Seiko's golden era. The Coin-Edge bezel and 36mm case give it a distinctive presence on the wrist. [seikata-wm-9ce6ff90a4d6]

Also known as: Monster

Specifications

Movement

Hand-Winding

Case Material

PVD Black

Case Width

36mm

Case Thickness

15.0mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

70m

Dial Color

Cream

Jewels

23j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1989

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