Seiko Cal. 4420 - 518

The Seiko 4420-518 represents an important milestone in Seiko's 1979 lineup. Powered by the 4420 caliber with 21j jewels beating at 21,600 bph, it delivers a 49 hours power reserve. [seikata-wm-243710d42c75]

Also known as: Sumo, Golden Tuna

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

35mm

Case Thickness

13.6mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

60m

Dial Color

Champagne

Jewels

21j

Frequency

21,600 bph

Power Reserve

49 hours

Year

1979

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