It's unusual for me to be posting US coins, as I don't collect them generally. However, I just dug up my PiggyBank from the move and had to paw through it's contents.
It's only got about ten coins, but they're all older US coins that I've had for years. I am thinking they probably came from my Great Grandmother, but it's been so long that I don't really remember anymore.
Not exactly AU condition, but the 1898 coin has a very gentle rainbow tone to the fields that I really love. Either way, both coins are nice enough that I think they deserve to be put in something nicer than a ceramic piggybank.
US Half Dollar, 1898, no mint mark:
US Half Dollar, 1907, New Orleans 'O' mint mark: