The 90s still was trailing off the Oil Crisis, trucks having 55 on the dash (and nothing more) was still commonplace.
Modern cars can still be insured without governor. A 2010s Fiesta still can hit its top speed of 135 (gear limited and not a governor).
As long as your dust isn’t conductive (such as metal dust from a machining shop) it really isn’t a real concern. Most of the time if dust kills something: its caked on, thermally choking components, and often mixed with something else like tar from cigarettes.
Exposed and on display like this, the owner is probably going to be meticulous about air dusting it often.