I just checked the scan "confirming" that it is accepted by Poland and that proof is a temporary 14 day visa issued in June 1990 in Berlin embassy by a 65y old communist diplomat/spy (according to publicly available documents). With a stamp of "Polish People's Republic" - a name that was changed to "Republic of Poland" at the end of 1989. I guess that was a moment in time where anyone in that embassy could happily stamp an outdated visa on anything for $50.
I'm now very curious about the stories behind all of these. Did someone attempt to enter the EU with a Byzantine Empire passport?? What did it even look like?
I just checked the scan "confirming" that it is accepted by Poland and that proof is a temporary 14 day visa issued in June 1990 in Berlin embassy by a 65y old communist diplomat/spy (according to publicly available documents). With a stamp of "Polish People's Republic" - a name that was changed to "Republic of Poland" at the end of 1989. I guess that was a moment in time where anyone in that embassy could happily stamp an outdated visa on anything for $50.