This period are really fascinating!
With printing problems, technology, up to politics and situation in new country named SHS (Serbia-Hrvatska-Slovenia) - but history are archived!
Here I wish to show one inverted overprint on Michel #67, 3f face value, inverted overprint, catalog value for normal are minimal (0.50 e), but inverted overprint will reach much-much higher asking price!
Comparing it on market in Yugoslavia, this items can reach even near 100$ per one in mint condition!

 
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