Among the many designs received, those submitted by Csar Kaczmarczyk were selected. How to Identify Polish Pottery Here are some of the key ways to identify Polish pottery. The auction house offered the finest known copy of this exceptional stamp, which was previously part of Grabowski collection. Stamps really are amazing, because they remind me of the good old days, where we just write letters to communicate with someone very far from us. See the full TOP-10 rating of most rare and most expensive stamps of Poland on FindYourStampsValue.com What rare stamps are collectors looking for? $21,850. Only on rare occasions is one artist responsible for the whole process, and these artists tend to be extremely experienced and skilled. After 1865, only Russian Imperial stamps were valid for use by the Congress Poland. //-->, The most expensive actual stamps of Poland at ebay.com,