Check the listing for details. Czechoslovakia, 1930 Airmail Set, Scott C10-C17a, FREAK Missing Hill, C13, MH. Color: Multi-Color. Listed at 65.59 USD. The 3 photos show the 10 stamps for purchase. Czechoslovakia, 1930 Airmail Set, Scott C10-C17a, FREAK C13, 10 Stamps, MH & Used 1930 Variety, Printing ERROR "NO HILL AT LEFT ", RED VIOLET , C13 (3k) Note the difference in C13 (3k) compared to the normal C13 (also shipped). The 10k is C16, Used Included with C17 is C17a (Perf 12) 9 stamps are Perf 13 1/2. 9 stamps are MH Mi 303-310 We have been a stamp collector and enthusiast for 50 years. We consider what we sell are fill ins for the advanced collector or stamps that may be preferred by any collector. We do not provide grading for stamps. We provide Scott numbers when we are sure and have tried to select stamps that are attractive to the eye and practical for mounting. Stamps are excellent historic and educational tools. APS Member Number 223336