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postage
1954, Dec 15 scientists (1954) wmk. stars (Cuba) p. 12x12.5
| X | 30f | dkviobl | János Irinyi |
1963, Jul 20 unwmk p. 11
| X | 40f | dkviobl | Szegedin Festival |
1963, Sep 3 (no perf info)
| X | 40f | dkviobl | Markovits |
1973, Feb 19 Copernicus 500th issue p. 12
| X | 3fo | dkviobl | Nicolaus Copernicus | — | — |
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