I realize that. But if a buck tag is a "helper" plate that called out options (as radiator support markings do), it seems rather curious that 65 and 66 Metuchen cars would use
RM on radiator support markings to denote Rocker Mouldings, while
RM on buck tags meant remote mirror. It would have been rather confusing to line workers.
Now in Dearborn, it could have well been that
RM meant rocker mouldings, as they used that same code when they began using buck tags in 67.
Isn't this just another case of differences between plants?