My experience is only with my Canadian made Chevy and gmc trucks
My red 1950 Chevy 1 ton I got both original keys that had the 4 digit knock out still in the keys with the code that the manual instructs you to remove and keep in a safe place to order new keys, these keys match other trucks I know of but don’t own and replacement keys I have never seen someone stamp the code into the center removable tabs.
Them my 53 Chevy one ton from my grandpa has one common key And my 53 gmc 1 ton dump truck is also 1 common key for everything
-s
