Seiko Cal. 4521 - 550

Released in 1982, the Cal. 4521 with design code 550 was part of Seiko's domestic market collection. The Bidirectional bezel and 45mm case give it a distinctive presence on the wrist. [seikata-wm-bce7dcb80b3c]

Also known as: UFO, Rally

Specifications

Movement

Hand-Winding

Case Material

Gold-Plated

Case Width

45mm

Case Thickness

9.8mm

Lug Width

18mm

Crystal

Acrylic

Bezel

Bidirectional

Water Resistance

100m

Dial Color

Black

Jewels

32j

Frequency

28,800 bph

Power Reserve

55 hours

Year

1982

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