It would appear that Fitz Jones was an entrepreneur, not above a little self promotion (or a lot!) He seems to have sold a rather extensive line of cheap plastic grips for revolvers and semi-autos. They were very popular in about the mid-fifties. He also sold, during that same time, some higher quality wood grips, at least for revolvers. I communicated with him briefly around 1996 or '97 when I first got my Star Progressive, but IIRC, I never really was able to get anything much from him but promises, even then he was "out of" whatever it was i needed at the time.
He was listed on the High Road Forum as being 83 in 2009, so if he is still living would be 100 years old... I doubt he is very actively involved in the industry today.
Froggie