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Omega developed a moon phase indication watch in 1947 when these types became popular. Unfortunately, the moon phase watch was relatively short lived, and it was phased out of production in the early 50’s. Mine is a round 18k solid yellow gold case with central date hand and apertures for the day of the week and month, and a subsidiary dial for constant seconds and phases of the moon. I was fortunate to buy this watch from the original owner who lived in California all his life. The dial is original and untouched.
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Being a California watch, the movement looks almost brand new after over 50 years in service. When first issued in 1947 the movement had a designation Cal. 27 DL PC AM 17P, but changed to Cal. 381 in 1949. The movement has 18,000 half oscillations per hour, 17 jewels and is shock resistant. Corrections are made via setting pins on the sides of the case. Original parts are getting very difficult to obtain for this movement. It’s similar in design to the Cal. 30mm and is fairly flat, only 5.25mm in height.
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