Seiko Cal. 4540 - 537

The Seiko 4540-537 represents an important milestone in Seiko's 1968 lineup. Powered by the 4540 caliber with 26j jewels beating at 21,600 bph, it delivers a 39 hours power reserve. [seikata-wm-e3fff24d20da]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

38mm

Case Thickness

9.8mm

Lug Width

21mm

Crystal

Acrylic

Bezel

Coin-Edge

Water Resistance

130m

Dial Color

Cream

Jewels

26j

Frequency

21,600 bph

Power Reserve

39 hours

Year

1968

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