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WHAT MAKES SOMETHING COLLECTIBLE?
The first collectibles - objects made by manufacturers for the express purpose of collecting - came as premiums in other products: baseball cards in packs of cigarettes or bubble gum, for example.
Ref. https://deseretnews.com/dn/view/1%2C3949%2C%2C00.html
Like kon said anything can be a collectable as long as you like that certain thing you are collecting. Even if no one else does it's still your collectables and if someone does it will have more worth to them.