antiquarian:
also called ‘antiquary‘ with plural form ‘antiquaries’ & archaists; plural: ‘antiquarians‘ — for the right pronunciation, please click here)

an antiquarian of books
a person who buys and sells very old but valuable things;
a person who has a lot of interest in old and rare objects, and studies and collects very old but valuable things (antiquities/antique),

an antiquarian exhibition
An antiquarian may seem to be a fool who wastes his/her money on old things, but once you get to know the beauty and artistic value of those old things, you do not hesitate to be an antiquarian yourself!
Some antiquarians make a lot of money selling old things, including idols, weapons of the past or even a post card of the last century which had the picture of a celebrity.
