Seiko Cal. 5660 - 556

Seiko 5660-556

The Seiko 5660-556 represents an important milestone in Seiko's 1978 lineup. The Rotating bezel and 40mm case give it a distinctive presence on the wrist. [seikata-wm-90caf8b27996]

Also known as: Tuna, Bullhead

Specifications

Movement
Automatic
Case Material
Stainless Steel
Case Width
40mm
Case Thickness
13.4mm
Lug Width
20mm
Crystal
Mineral
Bezel
Rotating
Water Resistance
50m
Dial Color
Burgundy
Jewels
36j
Frequency
21,600 bph
Power Reserve
36 hours
Year
1978

Related Models

seikata-wm-90caf8b27996