This is a beautiful set of used plate blocks of 6 of Canal Zone 142-145, the Gold Rush Centennial issue from 1949, centered F/VF and with a very light cancels.  Used plate blocks are not common and this is a pretty set. There is a light bend on one stamp on the 12c, and there is a diagonal bend on the 18c affecting 3 stamps. Scott $54 as mint, which these are not. Still a great addition to a Canal Zone specialist collection.