Seiko Cal. 4553 - 240

This Spring Drive model from 1981 features a 45mm Hardlex-Coated Steel case. Powered by the 4553 caliber with 28j jewels beating at 28,800 bph, it delivers a 50 hours power reserve. [seikata-wm-885fa852d331]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

45mm

Case Thickness

11.1mm

Lug Width

20mm

Crystal

Mineral

Bezel

Fixed

Water Resistance

130m

Dial Color

Black

Jewels

28j

Frequency

28,800 bph

Power Reserve

50 hours

Year

1981

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