Two nice examples of inverted overprints of the Mostar provisional issue. First is a marginal pair of 30 kn / 3.50 kn with inverted and large shifted overprint. The second is 30 kn / 1 kn with inverted overprint and overprint on the back.
1945 Mostar provisional issue, inverted overprints, both with Zrinjšćak certificate.
