There may be variation on the stamping depending on the factory. Here is a pic of my 1950's tag.
This is not a "Vin" tag. They were body serial numbers. Some states used the serial number and some used the engine number for titles and registration. "Vin" numbers weren't used until 1954 and then were standardized in to the current 17 character system until later. Compare your title and make sure your truck was titled by the serial number. If it was by the engine and you don't have the original engine you will have no numbers matching the title.