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All watches have weaknesses in the design which vary in severity and frequency. In the case of the Daytona one of the most frequent fault we see at here at SHWR is the where the tube in the main plate of the watch where the winding stem enters wears and becomes ovoid.
Here we have a pocket watch with a broken centre wheel arbour. This is a very common point of wear in larger watches and is caused by the pressure exerted when changing the time. The safest way to repair this fault is to make a new one from scratch.
One of the many problems with early Cartier movements are their setting mechanisms. In this example you can clearly see parts are missing and broken. Unfortunately somebody made a poor attempt trying repair this!