Something like this in Massachusetts too , my mother still lives there and has a 4 digit plate my father got long _long_ ago (they divorced in the early 60's) she keeps it to remind her how [censored] off she still is after over 40 years !.
(she's full of pi$$ & vinegar)
Here in So.Cal. (land of Fruits & Nuts) the black & yellow plates issued from 1963 to 1969 are beginning to die out to attrition , the DMV won't (yet) allow them as YOM plates so having a pair on your vehicle means (more or less) that it's been in constant registration since new , adding value to your daily beater or an actual classic according to some folks .
I've recently discovered how to keep these on a old junker you just drug out of the desert and at no cost either , the lazy assed welfare to work DMV clerks don't want to do it but calling for a supervisor usually get it done O.K. .
A couple fellows I know got some in under the YOM law , they just handed them in for inspection and were silent , the silly DMV girl
had no idea they were's '59 plates .
