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Bottles
Bottle collecting is becoming a dying art because the generation that started the craze is getting too old for bottle finding antics. The bottles we're talking about here are bottles made prior to 1920. The older the better. There are bottles yet to be discovered right here in America that are older than the nation itself. The age of the bottles in your area depends on when it was explored and settled. Look into bottle collecting for more info!s
Tin types
Tin types and daguerrotypes are those old photos printed on metal from the 1800s. You can find them in antique stores or online. You could even pick a theme for yours. Try collecting only those from the Civil War or tin types with pets. You choose!
Heirloom seeds
You don't have to plant them all or even plant them now. Help preserve flowers that actually smell or tomatoes that really taste good! Look up seed saving societies and learn more about this fun and very important hobby! You can meet all sorts of interesting people when you see heritage plants in the yards of older homes or even along roadways or in old parks!
Neon signs
Not just any neon signs - vintage neon signs with their ethereal glow. What we have now pales in comparison to the glow of an older neon light. As older establishments shut down, those neon signs that lined the old highways should be preserved. And how cool would a display of them be? Especially if you have room outside!
Art
Sure, it's a super expensive hobby if you're trying to score Rembrandts, but you could start following art scenes in your own locale to see what's interesting to collect. Visit art shows, galleries, or just pay attention to local artists and you might find the direction you want to take!
Coins
Coins are an excellent thing to collect for two reasons - one, the truly collectible coins go up in value because of their historical value or rarity. Two, because if the conspiracy theories pan out and the world does fall apart, you'll have real silver to trade instead of paper money!