Seiko Cal. 6640 - 858

The Seiko 6640-858 represents an important milestone in Seiko's 1969 lineup. With its 21mm lug width and 13.0mm profile, it sits comfortably on most wrists. [seikata-wm-d0831677b1cc]

Also known as: Tuna, UFO

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

35mm

Case Thickness

13.0mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

110m

Dial Color

Green

Jewels

34j

Frequency

28,800 bph

Power Reserve

37 hours

Year

1969

Related Models

• Seiko 6111-397
• Seiko 5678-236
• Seiko 6234-715
• Seiko 5612-358
• Seiko 6374-695
• Seiko 0743-420
• Seiko 7166-531
• Seiko 3824-577
• Seiko 0757-977
• Seiko 4558-144
• Seiko 5687-610
• Seiko 6338-684