This is sometimes called Split Plate Doubling, but it's not collectable. The copper plating over the zinc core was stretched to the breaking point and separated. The zinc core may start to break down with further exposure to the elements. Some coins like this corrode to the point of sections of the coin breaking off or leaving the remaining copper hallow.
You may want to keep it as a nice study example, but if not, spend it before it disappears!
The first US coin motto was found on a 1792 half disme and read: "LIB (erty) PAR (ent) OF SCIENCE & INDUSTRY"
On the date area, it is showing DDD (Die-Deterioration-Doubling). The split plating is a striking issue and the DDD is a die aging issue. Neither are worth a premium. In fact the time clock is counting down on the split plating example. On the Mintmark, that is showing also split plating, not a RPM. So three strikes and this ones out of here. Put it back to work.