Seiko Cal. 6631 - 834

The 6631-834 is a sought-after Spring Drive piece from Seiko's golden era. Powered by the 6631 caliber with 27j jewels beating at 36,000 bph, it delivers a 56 hours power reserve. [seikata-wm-f4e3379025fd]

Also known as: UFO, Silverwave

Specifications

Movement

Spring Drive

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

9.0mm

Lug Width

18mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

110m

Dial Color

Black

Jewels

27j

Frequency

36,000 bph

Power Reserve

56 hours

Year

1980

Related Models

• Seiko 4584-780
• Seiko 6286-835
• Seiko 6637-178
• Seiko 4549-294
• Seiko 4552-968
• Seiko 7135-297
• Seiko 5684-630
• Seiko 6610-765
• Seiko 6149-537
• Seiko 5655-519
• Seiko 6190-830
• Seiko 4467-330