I Have Travelled In A few Countries,

over the years,

such as India, Zaire, Zambia, Singapore, Philippines, plus several in Europe not to mention the Congo, so I am fairly use to handling different currency's, but I have never been to the USA, which is just as well as they seem to have some different currency denominations than I would have expected, such in this case a $30 bill,

and how would you go about spotting a fake $1,900?

and imagine changing a $1,000,000 bill and find it was a forgery!