Booklets of the World; U.S. and Worldwide; Russia
April 6-7, 2011 and April 11-12, 2011
| Images | Description | Current Bid |
 | Lot #1347 COLOMBIA Air Post 1920 10c red brown, vertical tete-beche strip of four, unused without gum as issued, v.f., with cert., (*) Catalog #YT 11b Catalog Value €1,400 | Unsold |
 | Lot #1348 COLOMBIA Air Post 1920 10c carmine, vertical tete-beche pair, unused without gum as issued, v.f., handstamped signatures, with cert., (*) Catalog #YT 11c Catalog Value €1,850 | Unsold |
