Seiko Cal. 5638 - 521

This Automatic model from 1974 features a 37mm Hardlex-Coated Steel case. Powered by the 5638 caliber with 24j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-a78202f9a81e]

Also known as: Rally, World Timer

Specifications

Movement

Automatic

Case Material

Hardlex-Coated Steel

Case Width

37mm

Case Thickness

12.4mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

160m

Dial Color

Burgundy

Jewels

24j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1974

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