Seiko Cal. 4537 - 540

Released in 1972, the Cal. 4537 with design code 540 was part of Seiko's domestic market collection. Powered by the 4537 caliber with 28j jewels beating at 28,800 bph, it delivers a 55 hours power reserve. [seikata-wm-6dba09aae8b4]

Also known as: UFO, Sportsmatic

Specifications

Movement

Hand-Winding

Case Material

Hardlex-Coated Steel

Case Width

38mm

Case Thickness

11.2mm

Lug Width

19mm

Crystal

Acrylic

Bezel

Inner Rotating

Water Resistance

60m

Dial Color

Burgundy

Jewels

28j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1972

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