Seiko Cal. 5660 - 985

The Seiko 5660-985 represents an important milestone in Seiko's 1977 lineup. Powered by the 5660 caliber with 24j jewels beating at 28,800 bph, it delivers a 72 hours power reserve. [seikata-wm-efc7912dec16]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

15.6mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

140m

Dial Color

Navy

Jewels

24j

Frequency

28,800 bph

Power Reserve

72 hours

Year

1977

Related Models

• Seiko 4463-563
• Seiko 6375-436
• Seiko 6152-484
• Seiko 5691-212
• Seiko 7196-324
• Seiko 4464-806
• Seiko 7149-583
• Seiko 3854-328
• Seiko 5225-140
• Seiko 7073-136
• Seiko 4510-511
• Seiko 7019-694