50/7 Kn on offset paper is the rarest paper of the Mostar provisional issue. Only 50 stamps were overprinted on this paper. Price ranges from 700 EUR and up. Therefore, check for a 50/7 Kn on offset paper whenever you see this set. Here are some tips you can follow:
- The overprint is shifted to the right and down
- Offset paper is a non-transparent, white colour with white and shiny gum (see here)
- The stamp with gum thickness is between 0.085 and 0.095 mm (see here)
1945 Mostar provisional issue, No. 9, 50/7 Kn on offset paper. Only 50 stamps could exist. Ex Tiberio. Note that the overprint is shifted to the right and down - all 50 stamps have the same shift, so this could be a first indicator that you may have this rare stamp.
