Stamps of United States, 1918 air issue
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airmail
1918, May 13 1918 air issue unwmk p. 11
| X | 6c | org | Curtiss Jenny | |||
| X | 16c | grn | Curtiss Jenny | |||
| X | 24c | carrose & bl | Curtiss Jenny | |||
| - | 24c | carrose & bl | Curtiss Jenny, v. center inverted | 10,000 – 100,000 | 10,000 – 100,000 |
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