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
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
Colloquially ‘Austria’ (or equivalents) was still widely used, just as the Ottoman Empire is referred to Turkiye here.