Seiko Cal. 3875 - 640

Seiko 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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