Let's assume an individual has no knowledge of WWII, therefore of who Hitler was (maybe they are uneducated, never paid attention, exist in a future so far ahead that it is no long heavily covered in school and they missed they day. It's not relevant anyway). They travel back in time and accidentally hit young Hitler…

It's very cheap to get old currency. You could buy old silver certificates for only a few cents over face value, which still leaves you with a massive profit margin when you spend it at 1963 market rates. Getting 1963 coins would actually be more expensive because of there silver content (outside of pennies and…