Seiko Cal. 6631 - 154

Released in 1977, the Cal. 6631 with design code 154 was part of Seiko's domestic market collection. The Inner Rotating bezel and 44mm case give it a distinctive presence on the wrist. [seikata-wm-7fe48228ee35]

Also known as: UFO, Goldfeather

Specifications

Movement

Quartz

Case Material

Gold-Plated

Case Width

44mm

Case Thickness

10.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

50m

Dial Color

Blue Sunburst

Jewels

33j

Frequency

28,800 bph

Power Reserve

54 hours

Year

1977

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