The first item we will be looking at are the Sterling Plastic Educator Pencil Cases. I have found 5 different ones in the #558 and #562 series. In most cases Sterling Plastic assigned a #500 series number to their items. The one pictured here is the Presidents #562 which ends with President Nixon, but I also have the Presidents #558 ending in President Johnson and ending with JFK. The other 4 are the States and Capitals, Important Dates in American History, Map of the World, and Our Solar System. Since some of these cases are #558 and #562 series then we can assume that the #558s were made first followed by the #562s. at the bottom of the lid you can turn the dials to see other Presidents or other info.