All 1945 Slovenian provisional issues were overprinted in enviably high quality. That is a reason for a small number of errors and specialties that are available today. Therefore, I was pleasantly surprised when I found the entire sheet of Maribor issue with very large slanting overprint.
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1945 Maribor local provisional issue, entire sheet of 12pf (Mi. 8) with large slanting overprint.
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Extract of the overprint.
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Lower right detail, showing one overprint extended to four adjacent stamps.