There was a time when I hoped to buy an original antique map with one of those paintings on it of sea serpents and stuff.
Before I found out how hard to get something like that was that is.
Get a replica. Of course the price on some of those will make you think you are buying the real thing. Also some of the 1930’s to 80’s charts are available online. My grandson was very interested in charts and maps. I bought him a globe and a replica.