I would definitely go to a good gun shop. Anecdote:
I bought an old 30-30 Winchester from a hole in the wall shop. For $500, I suddenly became jack palance!
I had this gun for a few years, occasionally shooting at the range. I kept shots in a 8″ plate at 100y but it kicked like a pissed off mule! A friend of mine took the serial# and researched the history of it. It was a 1932 trapper model custom made for the owner! I went to a reputed gun shop in Carmel, NY, and they informed me that it was worth $4500 and that they already had an interested collector!!
I sold it on the spot!!!:D