The Mahendra Sagar Collection of Inverted Centers
October 5-6, 2011
| Images | Description | Current Bid |
 | Lot #553 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, unused without gum as issued, v.f., with 2005 Alex Rendon certificate (Michel states only about 15 examples recorded, unpriced unused)  (*)Catalog #Mi.63K | Price Realized $850.00 |
