Seiko Cal. 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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