There is little conversation on these fantastic cars so I want to start one. I don't know much about the Silver Ghost other than the design lasted a long long time. The PI & II are more in my wheelhouse as they were dead in the middle of the Classic era. Springfield RR were made from about 1920 to 1931 in Massachusetts. I believe all the PI and PII cars were LHD. The PII chassis were built in England and shipped to the U.S. for body and assembly so I count them as "American".
Done in period by a known coachbuilder (or in this case the RR of American dealer) is accepted and fine and not something that would destroy the value of a car. Be aware that towncar bodies generally lag the market over other styles. Typically conservative with a drivers compartment designed for smaller chauffeurs.
This car is attractive, but chrome wires with whitewalls is a mistake.