Seiko Cal. 4540 - 556

The Seiko 4540-556 represents an important milestone in Seiko's 1972 lineup. Powered by the 4540 caliber with 31j jewels beating at 36,000 bph, it delivers a 63 hours power reserve. [seikata-wm-beea256d468b]

Also known as: Navigator

Specifications

Movement

Solar

Case Material

Gold-Plated

Case Width

35mm

Case Thickness

12.8mm

Lug Width

22mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

140m

Dial Color

White

Jewels

31j

Frequency

36,000 bph

Power Reserve

63 hours

Year

1972

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