When I first read Quicksilver I assumed that Newton as Warden of the Coin was one of the speculative fiction parts of the story. Nope, he was indeed involved heavily in improving the state of the art in authentic money.

I'm surprised he didn't get more negative attention from counterfeiters. But then once you get one hanged, and drawn and quartered, maybe they realize this cat has claws and they should leave it alone.