Austria Stamp Color Essay Proof Lot. Rare set of 8 early color proof essays on stamped envelopes; unusual proofs housed on stock page. The item "Austria Stamp Color Essay Proof Lot" is in sale since Thursday, April 18, 2019.This item is in the category "Stamps\Europe\Austria". The seller is "anthonysnj-stampsandcoins" and is located in Englewood Cliffs, New Jersey. This item can be shipped worldwide.