Seiko Cal. 4478 - 645

The 4478-645 is a sought-after Quartz piece from Seiko's golden era. Powered by the 4478 caliber with 27j jewels beating at 28,800 bph, it delivers a 47 hours power reserve. [seikata-wm-565c1a4b2667]

Also known as: Tuna

Specifications

Movement

Quartz

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

9.2mm

Lug Width

20mm

Crystal

Hardlex

Bezel

Fixed

Water Resistance

150m

Dial Color

Silver

Jewels

27j

Frequency

28,800 bph

Power Reserve

47 hours

Year

1974

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