Seiko Cal. 6640 - 926

The Seiko 6640-926 represents an important milestone in Seiko's 1967 lineup. The Coin-Edge bezel and 43mm case give it a distinctive presence on the wrist. [seikata-wm-05dc9fb81668]

Also known as: Emperor

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

43mm

Case Thickness

9.6mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

30m

Dial Color

Burgundy

Jewels

33j

Frequency

36,000 bph

Power Reserve

46 hours

Year

1967

Related Models

• Seiko 5689-504
• Seiko 3862-190
• Seiko 5641-445
• Seiko 5635-950
• Seiko 6149-908
• Seiko 0793-313
• Seiko 6151-557
• Seiko 3849-789
• Seiko 6295-703
• Seiko 6331-275
• Seiko 6138-645
• Seiko 5630-621