Seiko Cal. 5663 - 731

Released in 1975, the Cal. 5663 with design code 731 was part of Seiko's domestic market collection. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-dcbd4ea63d09]

Also known as: Helmet, UFO

Specifications

Movement

Spring Drive

Case Material

Gold-Plated

Case Width

34mm

Case Thickness

9.7mm

Lug Width

21mm

Crystal

Sapphire

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Champagne

Jewels

24j

Frequency

21,600 bph

Power Reserve

52 hours

Year

1975

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