If that tweed Bassman is the only one you own and the most treasured in your vast collection, I would not sell it. You appear to have other tools which might be sold and would amass less value in oncoming years then the Bassman. I have learned in my 59 years of playing that unless I owned either one, or possibly more of the holy grail 1950's-1960's Gibsons, early 1950's Fenders, a D'Angelico, early tweed Fender amps or early Marshall p-t-p amps, early Vox amps, maybe a Dumble, or Trainwreck, that I have seen nothing else which imho will appreciate enough to make saving them up for a 401 type retirement viable. Of course this is only one opinion, and I am not in your position to speak from currently owning some of these magnificent offerings that you own. ymmv In any event, I wish you the wisdom to make a decision which brings you happiness and no regrets.