Just looks like another item that was purchased and placed on the car/radiator
The tag would not be used on a radiator used at any plant during that build period
Hi Jeff - Are you basing that on the VIN 5F09A748576 and therefore the approximate date range / time period (approx June 1965) that car could been assembled in Dearborn? Is there a block of time that no plants used a rad supplier that did use the radiator tags (since the tags were vendor specific)?
My July 1965 Metuchen built GT with factory AC (as validated by buck tag and build sheet) has a C4ZE M2 rad tag on the radiator (on the passenger side). My radiator gave all appearances of being original to the car (all hardware, fan shroud and brackets etc. were intact, there were no competing truth marks from the fastners and everything was consistent with factory installation).
Regards,
Ron