Seiko Cal. 6640 - 366

The 6640-366 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6640 caliber with 24j jewels beating at 21,600 bph, it delivers a 36 hours power reserve. [seikata-wm-3a189cbbe8ad]

Also known as: Crown

Specifications

Movement

Automatic

Case Material

Titanium

Case Width

43mm

Case Thickness

10.7mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Rotating

Water Resistance

50m

Dial Color

Navy

Jewels

24j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1989

Related Models

• Seiko 6258-498
• Seiko 5246-778
• Seiko 4580-968
• Seiko 5275-293
• Seiko 6128-539
• Seiko 7121-194
• Seiko 5233-586
• Seiko 3882-691
• Seiko 7151-542
• Seiko 7156-127
• Seiko 3834-579
• Seiko 6286-462