Seiko Cal. 4578 - 673

Seiko 4578-673

The 4578-673 is a sought-after Hand-Winding piece from Seiko's golden era. Powered by the 4578 caliber with 21j jewels beating at 21,600 bph, it delivers a 46 hours power reserve. [seikata-wm-37cf28e8d629]

Also known as: Tuna, Bellmatic

Specifications

Movement
Hand-Winding
Case Material
PVD Black
Case Width
46mm
Case Thickness
10.2mm
Lug Width
18mm
Crystal
Sapphire
Bezel
Inner Rotating
Water Resistance
200m
Dial Color
Silver
Jewels
21j
Frequency
21,600 bph
Power Reserve
46 hours
Year
1980

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seikata-wm-37cf28e8d629