Cartier watches models and model numbers are found in several reference books, including 'Cartier - Watch Catalog.' Some websites, such as Orbita.com, also list Cartier model and serial numbers that can help identify the watch. The four-digit model number on the back of the case dictates the size and dimensions of the case, however, the materials can vary for different watches. Another unique model number is indicated only in the watch's paperwork. This number typically starts with a “W,” and is the same only for exact matches of the watch.

Some older models and quartz watches don't have a model number on the back of the case. In such an instance, it is necessary to determine the size of the case to identify the model.

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