A numismatist is someone who collects coins and/or medals a numismatist
A catapultist.
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I would call him a hobbyist.
dumb
A button collector??
normally .you call one .a letterologist.
a hoarder x)
Graphologist comes to mind or autograph hunter.
Someone with too much time on their hands and too much space?
An aquarist is someone who collects fish in aquariums. They can also simply be called fish keepers. Some collect a variety of fish, while others specialize in a few kinds.
A numismatist, usually collect forms of currency, such as tokens, paper money, and similar items.Coins.