There are at least three variants of boxes the Mustangs came in that I know of. I have an old kit with "F-51" on the boxtop, orange. Then I've got the latest one, the boxtop says "P-51", yellow, the flyer is that left-handed guy. But, in 1956, the "P-51" I built had a different box than these, very similar to the old Ringmaster box. In all instances, the planes are the same.
dg