Re: Conn 26M restore or keep original?
I hope this answer is timely for your situation. My opinion is that relacquering a horn is not a good idea for a variety of reasons. Cybersax has an excellent discussion of the issue.
There are good horns with good relacquer jobs that have their value depressed by the mere fact of being relacquered. Lucky you if you're the buyer; unlucky you if you're the seller.
I prefer bare brass, but stripping that 26M might have the same market value issues as relacquering.