As far as I can remember, I haven’t laid hands on one of the new $1 coins before this week. But waiting outside the U.S. Attorney’s Office on Congress on 9th Street earlier this week, I bought a hot dog from a vending cart. (Condiments free, but if you’re curious: Spicy mustard, pickle relish and sauerkraut. It was delicious.)
I paid with a $5 bill and got two coins back. This coin in fact:

Martin Van Buren, I thought? There’s a Van Buren Coin? Really?
Not that much mystery to it. I had forgotten: the U.S. Mint is making its way through all the presidents.