Seiko Cal. 5631 - 287

Seiko 5631-287

The 5631-287 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5631 caliber with 29j jewels beating at 36,000 bph, it delivers a 64 hours power reserve. [seikata-wm-d604935ae017]

Also known as: Arnie

Specifications

Movement
Hand-Winding
Case Material
Stainless Steel
Case Width
40mm
Case Thickness
12.0mm
Lug Width
21mm
Crystal
Hardlex
Bezel
Coin-Edge
Water Resistance
140m
Dial Color
Green
Jewels
29j
Frequency
36,000 bph
Power Reserve
64 hours
Year
1978

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seikata-wm-d604935ae017