Topic: Six-Years Plan

The following Polish postage stamp issues depict the Six-Years Plan:

Fischer 527 Naprzód do walki o plan 6-letni! (Złoty currency) in 1950
Fischer 542-545 Naprzód do walki o plan 6-letni! (Groszy currency) in 1951
Sheet 21 Naprzód do walki o plan 6-letni! (Groszy currency) in 1951
Fischer 577-578 Mining in 1951
Fischer 579-580 House-building in 1951
Fischer 581-582 Electro-industry in 1951
Fischer 605-606 House-building and electro-industry (15 Groszy surcharge) in 1952
Fischer 639 Mining (15 Groszy surcharge) in 1952