Brian it sounds like this would be a great addition to an article if one was done on this gun.
My wife's mothers Madain name was Potts. She was born in Oxford NJ in 1923 probably no relation but interesting just the same.
Here is an interesting DuPont Parker. Looks like it spent some time at the DuPont Wilmington gun club. It appears the VP at DuPont ordered for the President at the time. Like many of These old Parkers, sure wish I new more about the history of this gun.