It sounds like you got an arsenal refinish gun, since the barrel does not have a matching S/N. My Aero Sistema has seen alot of use, also with a none matching barrel, but was not refinished. I have put in a new GI barrel and have no plans to modify it further.
It may not be a true collector, but since I have other pistols, including 1911's, I will leave it original, and suggest you do the same. BTW, AFAIK, the Aero's had a limited production of some 4285 pistols, so it could be more collectible than other models.