Seiko Cal. 6351 - 631

The 6351-631 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 6351 caliber with 29j jewels beating at 28,800 bph, it delivers a 59 hours power reserve. [seikata-wm-cf338331d3a4]

Also known as: Bullhead, World Timer

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

13.7mm

Lug Width

19mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

29j

Frequency

28,800 bph

Power Reserve

59 hours

Year

1966

Related Models

• Seiko 6667-368
• Seiko 4550-130
• Seiko 0752-699
• Seiko 5296-514
• Seiko 4523-232
• Seiko 7180-852
• Seiko 5215-865
• Seiko 5612-380
• Seiko 3843-406
• Seiko 7049-539
• Seiko 6120-236
• Seiko 5292-700