Seiko Cal. 6640 - 912

This Quartz model from 1975 features a 44mm Titanium case. With its 22mm lug width and 9.3mm profile, it sits comfortably on most wrists. [seikata-wm-851d7a25b7d9]

Also known as: Bellmatic

Specifications

Movement

Quartz

Case Material

Titanium

Case Width

44mm

Case Thickness

9.3mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

White

Jewels

21j

Frequency

21,600 bph

Power Reserve

66 hours

Year

1975

Related Models

• Seiko 4439-623
• Seiko 3841-172
• Seiko 4476-278
• Seiko 6366-453
• Seiko 0747-730
• Seiko 7090-260
• Seiko 7182-580
• Seiko 6248-472
• Seiko 4474-765
• Seiko 5655-507
• Seiko 5649-598
• Seiko 5612-492