Seiko Cal. 5242 - 591

The Seiko 5242-591 represents an important milestone in Seiko's 1971 lineup. Powered by the 5242 caliber with 27j jewels beating at 21,600 bph, it delivers a 41 hours power reserve. [seikata-wm-31d4057eff09]

Also known as: Helmet, Navigator

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

36mm

Case Thickness

11.4mm

Lug Width

22mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

70m

Dial Color

White

Jewels

27j

Frequency

21,600 bph

Power Reserve

41 hours

Year

1971

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