Seiko Cal. 5631 - 305

Seiko 5631-305

The 5631-305 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 20j jewels beating at 36,000 bph, it delivers a 54 hours power reserve. [seikata-wm-d9b61e3821e5]

Also known as: Samurai

Specifications

Movement
Spring Drive
Case Material
Gold-Plated
Case Width
38mm
Case Thickness
14.5mm
Lug Width
21mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
190m
Dial Color
Navy
Jewels
20j
Frequency
36,000 bph
Power Reserve
54 hours
Year
1997

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