|Note the "4F" date stamping on this Mustang rear tag light assembly. This is from our 64 1/2 HiPo Mustang Coupe with a scheduled build date of June 8, 1964. The original license plate light on this car is dated June of 1964.
Here is another one of my "geeky" details for 1965 and 1966 Mustangs. Even the rear license plate light assemblies on these Mustangs are date stamped. I will note that I have observed many NOS Ford service part rear license plate light assemblies that did not have a date stamping.
Our example here is dated "4F" for June of 1964.