Seiko Cal. 6641 - 840

The Seiko 6641-840 represents an important milestone in Seiko's 1974 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-b6e3fc4a5402]

Also known as: UFO, Crown

Specifications

Movement

Solar

Case Material

Two-Tone

Case Width

40mm

Case Thickness

10.4mm

Lug Width

18mm

Crystal

Mineral

Bezel

Rotating

Water Resistance

190m

Dial Color

Cream

Jewels

29j

Frequency

36,000 bph

Power Reserve

58 hours

Year

1974

Related Models

• Seiko 4473-181
• Seiko 5275-362
• Seiko 5244-608
• Seiko 6678-606
• Seiko 3890-766
• Seiko 0733-680
• Seiko 6192-247
• Seiko 7125-450
• Seiko 3844-829
• Seiko 5645-684
• Seiko 6363-812
• Seiko 5685-612