Seiko Cal. 6637 - 813

The Seiko 6637-813 represents an important milestone in Seiko's 1991 lineup. Powered by the 6637 caliber with 27j jewels beating at 28,800 bph, it delivers a 62 hours power reserve. [seikata-wm-25dabef1a4a2]

Also known as: Samurai, World Timer

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

39mm

Case Thickness

14.7mm

Lug Width

20mm

Crystal

Mineral

Bezel

Inner Rotating

Water Resistance

140m

Dial Color

Blue Sunburst

Jewels

27j

Frequency

28,800 bph

Power Reserve

62 hours

Year

1991

Related Models

• Seiko 4435-581
• Seiko 5666-555
• Seiko 4434-351
• Seiko 6373-833
• Seiko 6381-120
• Seiko 7197-186
• Seiko 0771-455
• Seiko 0753-403
• Seiko 7043-860
• Seiko 7061-316
• Seiko 0731-619
• Seiko 4422-994