Seiko Cal. 6691 - 481

The Seiko 6691-481 represents an important milestone in Seiko's 1966 lineup. Powered by the 6691 caliber with 19j jewels beating at 21,600 bph, it delivers a 54 hours power reserve. [seikata-wm-b2ca71adcd2f]

Also known as: Helmet, Flighty

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

11.9mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

130m

Dial Color

Black

Jewels

19j

Frequency

21,600 bph

Power Reserve

54 hours

Year

1966

Related Models

• Seiko 4456-428
• Seiko 4557-111
• Seiko 7183-839
• Seiko 4577-404
• Seiko 4598-542
• Seiko 5697-704
• Seiko 7040-538
• Seiko 4411-423
• Seiko 0748-944
• Seiko 6664-123
• Seiko 4441-915
• Seiko 0755-701