Seiko Cal. 4540 - 104

The Seiko 4540-104 represents an important milestone in Seiko's 1972 lineup. Powered by the 4540 caliber with 22j jewels beating at 28,800 bph, it delivers a 63 hours power reserve. [seikata-wm-35c70b071f6e]

Also known as: Tuna, UFO

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

41mm

Case Thickness

15.4mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Fixed

Water Resistance

90m

Dial Color

Green

Jewels

22j

Frequency

28,800 bph

Power Reserve

63 hours

Year

1972

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