Did not see one NID, Lefever or Sterlingworth at today's show in Allentown PA
Forum members must be hoarding them!
Maybe a few.
I just bought my second NID 20. Its a '47 in near mint condition with 100% case colors and really nice wood - albeit on sided. Metal fit around the rib extension could have been better. I have one of the first version NIDs in the same configuration and quite high condition. I still need a "star grade" and the third one.I like them and they are quite a bit cheaper than the other "American classic" field grades.
Good luck with your search.