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| Number: | C5 |
| Description: | Airmail Service Insignia |
| Denomination: | 16c |
| Color: | dark blue |
| Details: | Single Stamp |
| Perforation: | 11 |
| Printing Type: | Engraved, Flat Plate |
| Gum Type: | Water Adhesive |
| Paper Type: | |
| Number Issued: | |
| Printer: | Bureau of Printing and Engraving |
| Date Issued: | 8/17/1923 |
| Watermark: | Unwatermarked |
| Plate Numbers: | Plate Numbers |
| Value: | eBay 'Sold' Values |
| Tagging Info | Click For Details |
