| Category | Description | Price (CLICK TO ORDER) | Image |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C1 1918 6 First Issue, Curtiss Jenny, Retail: 110.00 | $87.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C1 Original Gum, Retail: 60.00 | $48.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C2 1918 16 First Issue, Curtiss Jenny, Retail: 130.00 | $105.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C2 Original Gum, Retail: 70.00 | $56.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C3 1918 24 First Issue, Curtiss Jenny, Retail: 140.00 | $110.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C3 Original Gum, Retail: 72.50 | $57.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C4 1923 8 Second Issue, Propellor, Retail: 36.50 | $29.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C4 Original Gum, Retail: 20.00 | $16.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C5 1923 16 Second Issue, Emblem, Retail: 125.00 | $100.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C5 Original Gum, Retail: 65.00 | $52.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C6 1923 24 Second Issue, Biplane, Retail: 140.00 | $110.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C6 Original Gum, Retail: 75.00 | $60.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C7-9 1926-27 10 -20 Map and Planes (3), Retail: 19.50 | $15.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C7-9 Original Gum, Retail: 11.75 | $9.15 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C7 1926 10 Map & Planes, Retail: 4.00 | $3.20 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C7 Original Gum, Retail: 2.40 | $1.90 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C8 1926 15 Map & Planes, Retail: 4.75 | $3.80 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C8 Original Gum, Retail: 2.750 | $2.20 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C9 1927 20 Map & Planes, Retail: 13.00 | $10.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C9 Original Gum, Retail: 7.00 | $5.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C10-12 1927-30 Airmails (3), Retail 34.50 | $27.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C10-12 Original Gum, Retail: 18.50 | $14.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C10 1927 10 Lindbergh Flight, Retail: 11.75 | $9.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C10 Original Gum, Retail: 6.50 | $5.15 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C11 1928 5 Beacon, Retail: 8.00 | $6.40 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C11 Original Gum, Retail: 4.50 | $3.60 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C12 1930 5 Winged Globe, Flat, Retail: 16.00 | $12.75 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C12 Original Gum, Retail: 9.90 | $7.25 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C16/24 1931-39 #C16-17,19,23-24 Airmails (5), Retail: 26.00 | $20.75 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C16/24 Original Gum, Retail: 17.50 | $14.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C16 1931 5 Winged Globe, Rotary, Retail: 8.50 | $6.75 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C16 Original Gum, Retail: 5.00 | $4.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C17 1932 8 Winged Globe, Retail: 3.75 | $3.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C17 Original Gum, Retail: 2.25 | $1.80 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C18 1933 50 Graf Zeppelin, Retail: 87.50 | $70.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C18 Original Gum, Retail: 60.00 | $47.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C19 1934 6 Winged Globe, Retail: 3.60 | $2.90 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C19 Original Gum, Retail: 2.25 | $1.80 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C20-22 1935-37 20 -50 Trans-Pacific (3), Retail: 24.50 | $19.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C20-22 Original Gum, Retail: 17.50 | $14.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C20 1935 25 Trans-Pacific, Retail: 1.60 | $1.25 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C21 1937 20 Trans-Pacific, Retail: 12.00 | $9.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C21 Original Gum, Retail: 8.50 | $6.75 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C22 1937 50 Trans-Pacific, Retail: 12.00 | $9.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C22 Original Gum, Retail: 8.50 | $6.75 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C24 1939 30 Trans-Atlantic, Winged Globe, Retail: 11.50 | $9.00 | |
| U.S. UNUSED BACK-OF-BOOK - 1918-39 AIRMAILS | C24 Original Gum, Retail: 8.00 | $6.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1941-2012 AIRMAILS | C25-C150 1941-2012 Airmails Complete (128) Save 37.30, Retail: 168.80 | $131.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1941-69 AIRMAILS | C25-31 1941-44 6 -50 Transport Planes (7), Retail: 19.50 | $15.50 | |
| U.S. UNUSED BACK-OF-BOOK - 1941-69 AIRMAILS | C27 1941 10 Transport Plane, Retail: 1.30 | $1.00 | |