Seiko Cal. 4578 - 647

The 4578-647 is a sought-after Quartz piece from Seiko's golden era. Powered by the 4578 caliber with 20j jewels beating at 28,800 bph, it delivers a 40 hours power reserve. [seikata-wm-6a6d1c6d31b6]

Also known as: Helmet

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

34mm

Case Thickness

11.0mm

Lug Width

20mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

50m

Dial Color

Silver

Jewels

20j

Frequency

28,800 bph

Power Reserve

40 hours

Year

1992

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