The watch dates to 1954 and the case dimensions are 36mm in diameter and 41mm lug-to-lug. This is a great vintage watch that still fits the modern wrist very well. The nickname for the watch is "Disco Volante," or flying saucer because of the thick stepped round bezel. It has the automatic caliber 12-600 AT (AT designated automatic winding). The 12-600 AT is widely regarded as one of the finest, most elaborately constructed automatic movements ever produced not only for its superior technical qualities but also its design and decoration. It is an absolute example of industrial art.