I would say this is accurate. There are a lot of collectors out there of sample slabs and they do carry some value. The coin itself was never graded or even mentioned much on the slab (that is why there is no "D"). These were not about the coin but more about showing the slab to the dealer.
I think the coin# on the slab matches a Franklin. Maybe the # got changed at some point? It's interesting for a sample slab.