All three Slovenian provisional issues (Ljubljana, Maribor and Murska Sobota) have been overprinted with the same overprint composition that was adjusted only to the size and orientation of base stamps.
Recently, somebody showed me a negative to be used for etching the cliches, but under the high magnification it turns out that it is a fake. See more about the forgeries here.
Negative
Enlargement shows dotted structure that is typical of today's printers.
