Seiko Cal. 5631 - 963

Released in 1971, the Cal. 5631 with design code 963 was part of Seiko's domestic market collection. It features a Green dial protected by a Sapphire crystal and offers 110m of water resistance. [seikata-wm-22dbd38ce3e0]

Also known as: Samurai, Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

46mm

Case Thickness

10.1mm

Lug Width

22mm

Crystal

Sapphire

Bezel

Fixed

Water Resistance

110m

Dial Color

Green

Jewels

32j

Frequency

36,000 bph

Power Reserve

39 hours

Year

1971

Related Models

• Seiko 6382-661
• Seiko 6255-511
• Seiko 5275-434
• Seiko 7117-699
• Seiko 4492-788
• Seiko 4486-401
• Seiko 6197-883
• Seiko 6119-634
• Seiko 6612-163
• Seiko 6647-991
• Seiko 0722-716
• Seiko 6655-253