Seiko Cal. 3875 - 640

The 3875-640 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 3875 caliber with 31j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-ca1fe8259cc0]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

40mm

Case Thickness

14.2mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

31j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1988

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