When I came upon this coin I thought, “does numismatics have no boundries?”.
I have my doubts that JK Rowling had any idea that an albus was a unit of money before she came up with Albus Dumbledore. This coin is from Frankfurt, Germany (1656). The Albus was worth 2 Kruezers. They also had a 6 Albus coin which was worth 12 Kruezers.
So it turns out Albus was cash for Frankfurt before Albus was cash for Rowling.