Those older maps with overlay drawings were so cool

I never understood if it was Prussia or already Germany before WW1

Pre-Balkan wars even.

I love how Corsica has a picture of Napoleon.

It's should be from 1878-1885, as it shows Eastern Rumelia as a somewhat separate state. It was an autonomous province of Bulgaria for that 8 years; https://en.wikipedia.org/wiki/Eastern_Rumelia

I couldn't find anything to narrow it even more.

But it has some errors, e.g. Austria wa called Austria-Hungary at that time

I was bummed that they gave Bulgaria a fifth color, when they were clearly aware that you only need four colors, but then I saw that it's not a contiguous landmass, so I guess, that's a valid way of grouping those two...

Switzerland be like: