30 penny National Assembly with blue hand stamp overprint "C. I. H. S. ", cancelled "Opole ** b 16.2.20 5-6 N" on piece, very fine, expertized Mikulski and photo expertize Gunnar Gruber BPP ". Genuine and in perfect quality", Michel 1.600.- - illustration piece from the handbook with on this stamp only in this piece known cancellation!