1945 Romanian stamp Karl Marx. On the stamp is written: "Workers of the world, unite!"
Fabrica de timbre
<a rel="nofollow" class="external free" href="https://colnect.com/en/stamps/list/country/2668-Romania/year/1945">https://colnect.com/en/stamps/list/country/2668-Romania/year/1945</a>