Seiko Cal. 4540 - 422

The Seiko 4540-422 represents an important milestone in Seiko's 1970 lineup. Powered by the 4540 caliber with 31j jewels beating at 36,000 bph, it delivers a 71 hours power reserve. [seikata-wm-e0ac50a2934b]

Also known as: Helmet, Emperor

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

46mm

Case Thickness

9.3mm

Lug Width

20mm

Crystal

Mineral

Bezel

Coin-Edge

Water Resistance

90m

Dial Color

Blue Sunburst

Jewels

31j

Frequency

36,000 bph

Power Reserve

71 hours

Year

1970

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