What are the oldest Eastern European watch brands (pre 1920)? They can be either defunct or currently in operation.
We will define Eastern Europe as consisting of the following countries-
Albania, Belarus, Bosnia and Herzegovina, Bulgaria, Croatia, Czech Republic, Estonia, Hungary, Kosovo, Latvia, Lithuania, Macedonia, Moldova, Montenegro, Poland, Romania, Russia, Serbia, Slovakia, Slovenia, and Ukraine
+ [SE Europe] Cyprus, Greece, Malta, and Northern Macedonia