Pull any invoice out of your pockets. See the darkish inexperienced numbers on the top-left and top-right corners? These are serial numbers, and a few are extra uncommon than others. For those who occur to have paper cash with a novel or fascinating serial quantity, it could be value rather more than face worth. In truth, collectors are sometimes keen to pay massive bucks — a whole lot and even 1000’s of {dollars} — for uncommon paper…
