Memorabilian.
collects and studies FLAGS
Antique-collector
A Pencil Collector
A person who collects shells is known as a conchologist.
A numismatist is someone who collects coins and/or medals a numismatist
Someone who studies flags is called a Vexillologist
Someone who collects beer bottles.
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A catapultist.
someone who collects umbrellas
hoarder!