Any Value? 1904 Side-by-Side 12-GA

[Max Cadenasso]

Sorry for the delay, the gun was at a gunsmith who checked the barrels for any fractures, cleaned and lubricated it as well as test fired it. All went well, he said it shot great. Anyways here are some pictures if this helps.

Serial number is 122763, the barrels seem to be 28".

Ideally I'd like to get the black crap off the gun but from what I understand that is protecting it from rusting and the only other way to protect the gun and bring it back to its original glory would be to re-blue which is an expensive process. Is my understanding correct or is there some other way? I'll be shooting the gun probably 4-6 times a year at the range during good weather if that helps determine how rust-proof the metal needs to be.