German/Polish uncommon 'overprinted' piece, along with the 2 original issue pieces. Highly collectable pieces/set which are all in 'au-unc' condition as is not the norm with these types (verkehrsausgaben). German - Trebnitz : Polish - Trzebnica. The front overprint is purple with the round stampmark on the reverse being red! Scans show fronts and backs of the 3 pieces you are buying here.