Assuming you mean FS-501 (CONECA RPM-003), there are markers listed on Variety Vista:
https://www.varietyvista.com/06%20M...4DRPM003.htm
The wing-to-rim die crack marker is visible on both PCGS TrueView examples.
https://www.pcgs.com/coinfacts/coin...mages/145018
https://www.varietyvista.com/06%20M...4DRPM003.htm
The wing-to-rim die crack marker is visible on both PCGS TrueView examples.
https://www.pcgs.com/coinfacts/coin...mages/145018