Same type of stamp....same "5" exact and letter "N" In fact if you overlay them they match exact, even the spacing between the "No" and the three digit code is exact. So unless someone took an auth Tango back with stamp (of which only one I know of has been seen) and then re-backed the Cobb and then beat it up to make age? But this also goes back to the find where did they come from?
I dont think there's anything wrong with that card above...besides a few 100 bike tires and spokes...over it's years. IMO
Better scans..