[RocketManJames]

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Or, is there some standard way to determine which side is heads for all coins? Such as maybe using the side with the mint year as heads and other side as tails?

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There are US coins with the mint year on the tails side.

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I suppose you're referring to select gold coins from the 1800s. Also, there are some US coins that don't have a head, such as the 2-cent piece, but I've never been in a coin-flipping situation with them.

-RMJ