Seiko Cal. 5660 - 999

Seiko 5660-999

The 5660-999 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5660 caliber with 25j jewels beating at 36,000 bph, it delivers a 60 hours power reserve. [seikata-wm-bd821a684da0]

Also known as: Helmet, Sportsmatic

Specifications

Movement
Automatic
Case Material
PVD Black
Case Width
37mm
Case Thickness
13.3mm
Lug Width
19mm
Crystal
Mineral
Bezel
Inner Rotating
Water Resistance
120m
Dial Color
White
Jewels
25j
Frequency
36,000 bph
Power Reserve
60 hours
Year
1989

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