Seiko Cal. 4520 - 818

The Seiko 4520-818 represents an important milestone in Seiko's 1974 lineup. Powered by the 4520 caliber with 26j jewels beating at 21,600 bph, it delivers a 43 hours power reserve. [seikata-wm-88ccbf9f24cb]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Solar

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

60m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1974

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