Seiko Cal. 6640 - 975

The Seiko 6640-975 represents an important milestone in Seiko's 1969 lineup. The Coin-Edge bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-45ff713e2d22]

Specifications

Movement

Automatic

Case Material

Two-Tone

Case Width

41mm

Case Thickness

14.3mm

Lug Width

18mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

Cream

Jewels

24j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1969

Related Models

• Seiko 5628-282
• Seiko 6351-540
• Seiko 7145-960
• Seiko 6363-132
• Seiko 4495-563
• Seiko 5611-761
• Seiko 5698-465
• Seiko 6343-246
• Seiko 0798-222
• Seiko 0725-378
• Seiko 4574-912
• Seiko 6669-659