Seiko Cal. 5631 - 163

Seiko 5631-163

The 5631-163 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 5631 caliber with 21j jewels beating at 28,800 bph, it delivers a 42 hours power reserve. [seikata-wm-25fc3d03b6d5]

Also known as: Pogue, Baby Tuna

Specifications

Movement
Hand-Winding
Case Material
Hardlex-Coated Steel
Case Width
43mm
Case Thickness
9.8mm
Lug Width
20mm
Crystal
Mineral
Bezel
Coin-Edge
Water Resistance
70m
Dial Color
Green
Jewels
21j
Frequency
28,800 bph
Power Reserve
42 hours
Year
1968

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