Seiko Cal. 4520 - 423

This Spring Drive model from 1965 features a 41mm Hardlex-Coated Steel case. Powered by the 4520 caliber with 21j jewels beating at 28,800 bph, it delivers a 60 hours power reserve. [seikata-wm-ef0e98458c04]

Also known as: Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

41mm

Case Thickness

14.3mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

110m

Dial Color

Navy

Jewels

21j

Frequency

28,800 bph

Power Reserve

60 hours

Year

1965

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