All the newer Stainless Steel barreled
NEF Huntsmans have nickle SB1 frames that have ~HUNTSMAN~ stamped on the left side. They also have NEW ENGLAND FIREARMS stamped on them. If you are looking for a nickle
H&R circa 1970's Huntsman frame, you are out of luck unless you find someone that had one nickle plated?
Lots of newer nickle NEF Huntsman SB1 frames out there if that is what you are looking for.
Here is one of mine, but it is NFS.
Huntsman on top, Sidekick on bottom.