Seiko Cal. 4556 - 503

The Seiko 4556-503 represents an important milestone in Seiko's 1972 lineup. The Coin-Edge bezel and 38mm case give it a distinctive presence on the wrist. [seikata-wm-fff457653b5e]

Also known as: Helmet, Baby Tuna

Specifications

Movement

Kinetic

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

15.2mm

Lug Width

22mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

170m

Dial Color

White

Jewels

17j

Frequency

21,600 bph

Power Reserve

43 hours

Year

1972

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