U.S. & Worldwide Stamps & Postal History; The David Mace Collection of U.S. Stamps
April 24-25, 2018
| Images | Description | Current Bid |
 | Lot #1058 BOLIVIA Air Post 1924 Aviation School, 10c vermilion & black, center inverted, top sheet margin single, l.h., v.f., signed Sanabria, * Catalog #C1a Catalog Value $2,500 | Unsold |
 | Lot #1059 BOLIVIA Air Post 1924 Aviation School, 2b black brown & black, center inverted, sheet margin single, n.h., some toning and irregular perforations, signed Sanabria, with APS certificate. A rarity, only 25 issued ** Catalog #C6var | Price Realized $950.00 |
