Seiko Cal. 6663 - 540

Released in 1968, the Cal. 6663 with design code 540 was part of Seiko's domestic market collection. The Bidirectional bezel and 34mm case give it a distinctive presence on the wrist. [seikata-wm-e988bcd0aebb]

Also known as: Sumo, Bellmatic

Specifications

Movement

Hand-Winding

Case Material

Titanium

Case Width

34mm

Case Thickness

14.1mm

Lug Width

21mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

200m

Dial Color

Blue Sunburst

Jewels

30j

Frequency

21,600 bph

Power Reserve

45 hours

Year

1968

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