It was introduced over 80 years ago in 1941. Phillips NY watch auction this past weekend by coincidence sold one or more variations of each of the PCCs - 1518, 2499, 3970, 5020, 5970 and 5207. Plus 5004 and 5204. Beautifully photographed and with very well done descriptions and histories, makes for a great read. For anyone interested, the catalogue and results are on their website.