There are at least 4 different
DDR's for a 1959-P Franklin.
The "big" one is: 1-R-III; FS-50-1959-801
Yours may be #3 or #4 etc...
The variety MUST be in the cherrypickers book in order for NGC or PCGS to put the attribution on the label.
If you dont know which
DDR it is,then you will have to send it in for attribution to someone like James Wiles of CONECA.($5.00 per coin + $5.00 return postage)
On the other hand...NGC put the wrong date on the slab and that makes it an error slab and they are actually collectable in its own right.
I would send it to Wiles and get the attribution....then keep his letter with the coin....leave it in the present slab.If you ever sell it then its a double whammy because not only is it a
DDR variety but its ALSO a NGC error slab too.
They may have put a label from a different coin on yours.
I would leave it in that slab for sure.