Luxist inform us that rare South American stamps, in fact the world’s most valuable private collection of South American postage stamps, will be offered in a public auction in New York City on June 5 and 6, 2008.

The auction includes for instance the only surviving example of the 1859 one-peso “tête-bêche,” which has a pre-sale estimate of $400,000 to $500,000.
There is also an envelope from Chile with a unique block of 14 lithographed 5-centavo stamps of 1854 which is $400,000 to $500,000.
From Colombia there is a letter with a 5-centavo and a10-centavo stamp dated September 1, 1859, the first day these very first stamps of Colombia were issued The pre-sale estimate is $200,000 to $300,000.
You’ll find out more information on luxist and on siegelauctions