355 CSS 440 and 440b 1939-41 Chung Hwa Dr. SYS Die III, line perf., 15c. complete 4x5 transfer block of 20 stamps. "Spot in pearl" at transfer position 4/20

355 CSS 440 and 440b 1939-41 Chung Hwa Dr. SYS Die III, line perf., 15c. complete 4x5 transfer block of 20 stamps. "Spot in pearl" at transfer position 4/20