Seiko Cal. 6643 - 550

Released in 1981, the Cal. 6643 with design code 550 was part of Seiko's domestic market collection. The Bidirectional bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-ae5cadcad1f5]

Also known as: UFO, Goldfeather

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

41mm

Case Thickness

11.2mm

Lug Width

20mm

Crystal

Mineral

Bezel

Bidirectional

Water Resistance

140m

Dial Color

Silver

Jewels

25j

Frequency

21,600 bph

Power Reserve

57 hours

Year

1981

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