Trumpet in Connecticut

I am no expert but it does not appear to have any dings or scratches.  The entire instrument is tarnished inside and out.  Valves still pop up when depressed.  Top of valve buttons seem to have mother of pearl inlaid on top.  The mouth piece may or may not be original....seems to be out of place with the rest of the trumpet.  I am just trying to see if this trumpet is rare or ordinary and what it might be worth if cleaned up professionally.

Thank You!

Fair