The 2 c. stamp with the overprint commemorates the 100th anniversay of Chiriqui Province, in Panama, in 1949. Don't have Scott catalog for Panama stamps, so cannot tell you the number. The 1 c. "Star of Panama"air mail is interesting, commemorates the centennial of the founding of La Estralla de Panama newspaper in 1853. Don't have a Scott number for that one either. Sorry.