I can DEFINITELY get behind the sentimental attachment aspect, Migo! Those memories make it priceless!
As for me, maybe my "most beautiful" answer is a bit far-fetched- but in truth a wallet can only do so much. ANY wallet. So there's "beauty" to me in saving money!
There WAS a very nice men's clothing shop in my area that unfortunately was poorly located, obscure and went out of business. But the fellow who ran it was extremely nice to me and more than once let me have things for less than the ticket said.
So my "most beautiful" wallet is beautiful for the memory of being treated fairly and because it's really all the basic things I hoped for: genuine leather, black and the "passcase" style with a permanently attached flip-up flap on the inside left half, with picture window for ID. It was marked $25, this great gent sold it to me for $10. And, oh, yes, the wallet dimensions are conveniently large and the leather "feels" nice and soft! Being "sensible" is sometimes VERY beautiful! Sam, if you're reading, thanks for the royal treatment! Kindness IS remembered!