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Hello  
First I have to apologize, because I can not placed image. Last time I found this stamp in Warszawa. We here in Poland can not recognize this arms. We think this stamp had person (soldier) from any land east from Poland. Maybe it was prince family. 2 pairs of same letters wright in to alphabets. This picture of moon belongs not to polish heraldic. Could you help me?? Best regards from Warszawa.