Seiko Cal. 5631 - 313

Seiko 5631-313

The 5631-313 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 5631 caliber with 32j jewels beating at 21,600 bph, it delivers a 67 hours power reserve. [seikata-wm-73d6c97434f9]

Also known as: Sportsmatic

Specifications

Movement
Spring Drive
Case Material
Titanium
Case Width
44mm
Case Thickness
14.3mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Coin-Edge
Water Resistance
100m
Dial Color
Navy
Jewels
32j
Frequency
21,600 bph
Power Reserve
67 hours
Year
1993

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seikata-wm-73d6c97434f9