Stamps of Slovakia, 125th Anniversary of the Universal Postal Union issue
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postage
1999, Mar 12 125th Anniversary of the Universal Postal Union issue unwmk (no perf info)
| - | 4Sk | multi | letter sorting machine | .20 | .20 | |
| - | 12sk | multi | University in Žilina | |||
| - | 16sk | multi | Emblem of Slovakian Post with globe |
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