Stamps of Poland, Wieliczka ancient rock-salt mines issue
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postage
1979, Jul 14 Wieliczka ancient rock-salt mines issue unwmk
| X | 1z | multi | Mining machinery, p. 14.25x14 | — | — | |
| - | 1z | multi | Mining machinery, p. 14.25x14 | |||
| X | 1.50z | multi | Wieliczka Salt Mine, p. 14.25x14 | — | — | |
| - | 1.50z | multi | salt crystals |
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