Seiko Cal. 4578 - 643

This Quartz model from 1975 features a 41mm PVD Black case. Powered by the 4578 caliber with 18j jewels beating at 21,600 bph, it delivers a 40 hours power reserve. [seikata-wm-25e09df9f5ca]

Also known as: Tuna, Sea Horse

Specifications

Movement

Quartz

Case Material

PVD Black

Case Width

41mm

Case Thickness

10.7mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Silver

Jewels

18j

Frequency

21,600 bph

Power Reserve

40 hours

Year

1975

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