Overprint double occurred only on one horizontal row of No. 17, where one sheet was incorrectly inserted together with another sheet and received two plate strikes. So, altogether only 10 examples with double overprint could exist.
1945 Mostar provisional issue, No. 17 "War Tax" block of four from positions 1-2/11-12 showing overprint double on upper stamps. Ex Tiberio. Very rare!
