440 5c Dah Tung Dr. SYS surcharged 4c. in sheet of 100 with 'Double Tso' variety (Scott 440r CSS 500a) at position 78/100, few perf. separations

440 5c Dah Tung Dr. SYS surcharged 4c. in sheet of 100 with 'Double Tso' variety (Scott 440r CSS 500a) at position 78/100, few perf. separations