Buy circulated silver dimes. I like mercury dimes, because if the economy doesn't crash in your lifetime they have higher charm and curio value than pre-64 roosevelts.
With dimes you have a pretty well balanced mix of metal value and fungibility, coin value and barterabilty, and collectable and curio value.
Circulated silver dollars and quarters too, but dimes are close to optimum for a crashed economy. Spend some on collectable uncirculated if you like - a hedge bet, basically, that the economy won't crash.
It depends a bit on how much you want to spend and what you long term goals and plans are.
But, I bought most of mine years ago, so it's all gravy for me.
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