Seiko Cal. 6660 - 427

The 6660-427 is a sought-after Spring Drive piece from Seiko's golden era. The Fixed bezel and 42mm case give it a distinctive presence on the wrist. [seikata-wm-ee56005fd6e2]

Also known as: World Timer, Crown

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

42mm

Case Thickness

11.8mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

30m

Dial Color

Black

Jewels

22j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1966

Related Models

• Seiko 4523-702
• Seiko 5253-632
• Seiko 6189-768
• Seiko 4528-213
• Seiko 3827-889
• Seiko 6314-305
• Seiko 5278-989
• Seiko 4492-660
• Seiko 6154-138
• Seiko 7074-279
• Seiko 4594-700
• Seiko 4558-275