I have no idea what kind of 'museum' would even consider it as a display item, having no historical or reputational value, unless there's a Museum of Ripoffs somewhere.
Both the maker and
the instrument model do have historical and reputational value, whatever the value of
the particular guitar in question may or may not be.
The guitar was made by a smallish, once local, boutique maker which has grown into a largish international concern.
The guitar was made here in the city where the museum is located. The model was once their top of the line classical guitar.
The guitar is a definite anomaly, a dud among their otherwise lovely instruments.
The guitar will serve well as an exhibit piece in a glass case. It looks absolutely lovely. The woodwork is superb.
The donation does not take an excellent instrument out of circulation; it only takes
what should have been an excellent instrument but isn't out of circulation.
This is all good. Players are not being deprived of anything. The general guitar buying public at large is now protected from this instrument. Win/win.
The guitar will be appraised. I will get a tax receipt. Another win.