Canada #1764b 1998 45¢ Christmas Perf 13.1×13.6 , the scarce perforation variety. A fresh matched set of the four corners, 2 stamps in each block have a horizontal gum bend, which is visible on back but is not a crease as it does not show in fluid, very fine, never hinged. Unitrade: “Approximately 500 mint copies known, plate blocks are very rare.” Unitrade C$10,000.