A flipper is actually a Observe whose selection may be examine appropriate side up or the wrong way up, such as 0069000. Most collectors will would like to see a mix of 0s, 6s and 9s on flipper serial numbers, though some may take flippers with 1s and 8s. On https://peterk216lxi1.blognody.com/28373625/the-smart-trick-of-new-100-usd-banknotes-stack-that-no-one-is-discussing