Seiko Cal. 6633 - 423

The Seiko 6633-423 represents an important milestone in Seiko's 1974 lineup. The Bidirectional bezel and 39mm case give it a distinctive presence on the wrist. [seikata-wm-47d78c4bef07]

Also known as: UFO, Crown

Specifications

Movement

Spring Drive

Case Material

Titanium

Case Width

39mm

Case Thickness

13.9mm

Lug Width

19mm

Crystal

Hardlex

Bezel

Bidirectional

Water Resistance

100m

Dial Color

White

Jewels

24j

Frequency

21,600 bph

Power Reserve

50 hours

Year

1974

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