Panerai Classic Yachts Challenge PAM 571 Limited Edition Luxury Watches Panerai by wholesalewatches - June 3, 2016September 7, 20160 This Panerai watch is that it is likely the most limited production Regatta special edition ever made. PAM 571 just limites to only 50 pieces whereas previous Regatta special editions were produced typically in an edition of 500 Pieces. The PAM 571 was released to commemorate Panerai’s 10 year anniversary