Seiko Cal. 6640 - 237

The 6640-237 is a sought-after Hand-Winding piece from Seiko's golden era. With its 19mm lug width and 10.1mm profile, it sits comfortably on most wrists. [seikata-wm-e83045568e77]

Also known as: Bullhead

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

39mm

Case Thickness

10.1mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

80m

Dial Color

Champagne

Jewels

26j

Frequency

36,000 bph

Power Reserve

44 hours

Year

1966

Related Models

• Seiko 7098-477
• Seiko 7192-408
• Seiko 0730-509
• Seiko 4469-589
• Seiko 6183-322
• Seiko 3833-206
• Seiko 6245-900
• Seiko 6125-252
• Seiko 0794-477
• Seiko 6282-222
• Seiko 6184-910
• Seiko 3819-432