Ron S, no offense taken... IMO Simpsons is just relaying what Kenyon is purported to have said... not necessarily first hand... but time will tell.
A quote from our mutual friend Dwight in a recent thread applies here as to why they or anyone else would sell a gun such as this under these circumstances..
"Because they are in the business of selling guns--sometimes, particularly, uncommon or rare ones. Caveat emptor is implied in any transaction involving a Luger--they are under no obligation to do your homework."
Right-on Dwight!
Ron W, ... a new hobby of mine is CNC machining and technique... much jewelry these days is CAD/CAM produced... using wax as the design medium shaped in a small precision milling machine and then the jewelry is created in the lost wax mold process... I think the detail in the emblem design is too rich to have been created manually... and the mold may have been created in this manner... IF I had been asked to create these grips, and even if it had been done manually as you suggest, I would still have taken the time to make sure I had produced at least two sets of grips... They would look good on a shooter, eh?
(but not if there were an ORIGINAL Luger... only on reproductions made after say, 1936 or 37...)