Seiko Cal. 6637 - 477

Released in 1968, the Cal. 6637 with design code 477 was part of Seiko's domestic market collection. The Inner Rotating bezel and 41mm case give it a distinctive presence on the wrist. [seikata-wm-8495dab065de]

Also known as: UFO, Crown

Specifications

Movement

Spring Drive

Case Material

PVD Black

Case Width

41mm

Case Thickness

9.5mm

Lug Width

18mm

Crystal

Hardlex

Bezel

Inner Rotating

Water Resistance

30m

Dial Color

Green

Jewels

36j

Frequency

21,600 bph

Power Reserve

36 hours

Year

1968

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