Seiko Cal. 4557 - 531

The Seiko 4557-531 represents an important milestone in Seiko's 1973 lineup. Powered by the 4557 caliber with 22j jewels beating at 21,600 bph, it delivers a 70 hours power reserve. [seikata-wm-2f63cc98ffcb]

Also known as: Helmet

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

40mm

Case Thickness

12.4mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Rotating

Water Resistance

140m

Dial Color

Green

Jewels

22j

Frequency

21,600 bph

Power Reserve

70 hours

Year

1973

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