The NGC price guide says 290 in MS63, so 64 is probably 350 according to them, so, even though their prices are high, you did very well
The baden 1/2 Gulden pieces are generally somewhat scarcer than those from Bavaria and Wuerttemberg for example. They are moderately scarce, not rare as a type. Your example is a nice original and would typically bring 200-250 Euros in Germany. So at $ 210 you did OK. Not great, but certainly OK. Enjoy your coin.
I would say making 50% isn't bad if you should resell, I think it is very good, especially for a personal purchase