U.S. and Worldwide Stamps & Postal History
February 28-March 1, 2017
| Images | Description | Current Bid |
 | Lot #250 COSTA RICA Air Post 1937 National Products Exposition, complete set of four different large die proofs in issued colors, also a master die in ultramarine (value tablets blank) each die sunk on full size card from the American Bank Note Company, v.f. P Catalog #C31-34P | Price Realized $1,400.00 |
