Seiko Cal. 6660 - 370

The 6660-370 is a sought-after Automatic piece from Seiko's golden era. Powered by the 6660 caliber with 33j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-5b26680e9ea6]

Also known as: Bullhead, Crown

Specifications

Movement

Automatic

Case Material

PVD Black

Case Width

43mm

Case Thickness

9.9mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

50m

Dial Color

Champagne

Jewels

33j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1972

Related Models

• Seiko 5286-151
• Seiko 3837-999
• Seiko 3827-313
• Seiko 7078-503
• Seiko 5654-963
• Seiko 6377-139
• Seiko 6198-121
• Seiko 6213-609
• Seiko 5666-940
• Seiko 4471-890
• Seiko 6110-361
• Seiko 5666-742