this is an interesting question, & have to assume that the OP was thinking revolvers when he posted in the revolver topic... but when it comes to newly manufactured ( not older guns ) either revolvers or semi autos, what do you think might be cherished by your desendants ???
of "new" revolvers purchased, my S&W 610 is nice ( took 3 times back to S&W, before it was worthy of it's name sake, but it's nice now ) & my 3 Ruger new Vaquero Montados were all 3 nice right from the factory... I'm sure the one I customized to a snubbie would be cherished, as it's something I changed on an already nice gun... I don't honestly think the plastic revolvers or semi autos have that same appeal... as far as autos, I like my 5 seven, but it's not shiney or nice enough, & hopefully not used in any life changing war or anything that will give it provenance... I'm sure the CZ autos would be cherished, but I haven't bought anything "new" in that lineage lately...
I'd have lots of Grandpa's rifles that would be cherished, but of my newer purchases... hmm... maybe my Guide gun, maybe my custom fast twist Ruger 22 Hornet... maybe my Browning stainless stalkers... but those have plastic stocks, & arent as pretty as those wearing wood... my custom built rolling blocks I'm sure of, but those are old rifles I made into new custom pieces
collectability down the line, will IMO, depend on a few things...
is it pretty ???
is it practical in the future ???
did the recipients herrs hunt with it, or customize it, or use it in a war or life changing event ???
so many of the modern guns have no soul...