The Mahendra Sagar Collection of Inverted Centers
October 5-6, 2011
| Images | Description | Current Bid |
 | Lot #554 VIETNAM, NORTH 1957 Fourth World Trade Union Congress, 300d purple value tablet inverted in mirror print on the upper right stamp, in block of four with three normal stamps, central postmark, v.f., with 2007 Alex Rendon certificate (Michel states only about 15 examples recorded)  Catalog #Mi.63K Catalog Value €500 | Price Realized $550.00 |
