Seiko Cal. 5660 - 399

Seiko 5660-399

The 5660-399 is a sought-after Automatic piece from Seiko's golden era. Powered by the 5660 caliber with 24j jewels beating at 28,800 bph, it delivers a 46 hours power reserve. [seikata-wm-bacf7f53b3f7]

Also known as: Monster, Tuna

Specifications

Movement
Automatic
Case Material
Gold-Plated
Case Width
45mm
Case Thickness
12.3mm
Lug Width
19mm
Crystal
Hardlex
Bezel
Rotating
Water Resistance
200m
Dial Color
Navy
Jewels
24j
Frequency
28,800 bph
Power Reserve
46 hours
Year
1979

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