Seiko Cal. 4540 - 638

The Seiko 4540-638 represents an important milestone in Seiko's 1973 lineup. The Rotating bezel and 37mm case give it a distinctive presence on the wrist. [seikata-wm-1292bd03aa10]

Also known as: Flighty

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

37mm

Case Thickness

15.3mm

Lug Width

20mm

Crystal

Acrylic

Bezel

Rotating

Water Resistance

170m

Dial Color

White

Jewels

20j

Frequency

28,800 bph

Power Reserve

56 hours

Year

1973

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