Yep they make pretty decent clones. I have special edition they did on Massdrop but sadly the 70g keys are causing major pain and I have to use my other keyboard with Topre switches for doing work :(
IBM outsourced keyboard production first to Lexmark, and then to Unicomp. Unicomp then later went and bought the patents and everything to spin-off their own products, still with the original tooling.
You'll find a lot of "Original IBM" keyboards that were built by Unicomp in license. I have a Model M4 from 2000 that was already built by Unicomp, sold by IBM with their own branding.
It was so terrible the first time. I wanted to cut off my hands. It went away and I got back to work. Eventually I had to stop work every hour from the pain.
It can't be the keyboard! My precious PS/2 buckling spring model M! I've been using it for fifteen years without trouble! THIS IS THE BEST KEYBOARD IN THE WORLD! I am such a fool.