Seiko Cal. 4539 - 645

Released in 1975, the Cal. 4539 with design code 645 was part of Seiko's domestic market collection. The Bidirectional bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-4a08dda99bd4]

Also known as: UFO, World Timer

Specifications

Movement

Solar

Case Material

Stainless Steel

Case Width

44mm

Case Thickness

11.1mm

Lug Width

18mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

180m

Dial Color

Navy

Jewels

27j

Frequency

21,600 bph

Power Reserve

61 hours

Year

1975

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