Rocky--
I know where you are coming from.
Just thinking, like Armand Swenson, for example, innovated several mod's to the 1911, but nobody who continues to make up guns using his mod's would ever think to call their products a "Swenson." Even his ambidextrous safety is not called a "Swenson safety."
I would have to go back to the Fitz article, but I suspect that such guns mod'd by subsequent gunsmiths do not carry their signatures...and if a buyer might somehow be led to believe they were buying an original done by Fitz they might not be able to confirm it...probably paying up because it is called a Fitz Special.
Larry
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Larry W. Williams
RKCC #CM-041
ABKA #046
RKS #1246