Seiko Cal. 5631 - 763

The Seiko 5631-763 represents an important milestone in Seiko's 1986 lineup. Powered by the 5631 caliber with 34j jewels beating at 36,000 bph, it delivers a 51 hours power reserve. [seikata-wm-d2e045ce30cd]

Also known as: Samurai, Tuna

Specifications

Movement

Automatic

Case Material

Stainless Steel

Case Width

40mm

Case Thickness

8.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Green

Jewels

34j

Frequency

36,000 bph

Power Reserve

51 hours

Year

1986

Related Models

• Seiko 6223-219
• Seiko 7086-820
• Seiko 5234-332
• Seiko 7190-783
• Seiko 4484-233
• Seiko 4587-443
• Seiko 5657-638
• Seiko 5693-650
• Seiko 7075-239
• Seiko 6321-736
• Seiko 6287-699
• Seiko 5286-941