Seiko Cal. 0731 - 420

The Seiko 0731-420 represents an important milestone in Seiko's 1965 lineup. Powered by the 0731 caliber with 20j jewels beating at 21,600 bph, it delivers a 53 hours power reserve. [seikata-wm-364de91459d1]

Also known as: World Timer, Emperor

Specifications

Movement

Spring Drive

Case Material

Hardlex-Coated Steel

Case Width

36mm

Case Thickness

8.1mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

130m

Dial Color

Black

Jewels

20j

Frequency

21,600 bph

Power Reserve

53 hours

Year

1965

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