In my experience there should be a part no., FoMoCo logo, and even a date code. It sometimes surprises me that Ford's suppliers could put that info in the smallest places. But looking at Stangman's originals there are none in this case. Maybe Ford just decided to put a removable tag on them instead. I've always loved that design!
I'm a Fairlane Club of America member (Fairlaneclubofamerica.com) and in the Fairlaner magazine there are occasional contributions from retired Ford stylists. One stylist told the story that he was tasked to come up with a roof emblem (C-pillar) for the new Falcon Sports Coupe. It was to be done by lunchtime, and he got in a rush with some other projects. When he finally got around to doing the new emblem, he did it while eating his sack lunch. So what inspired him? An Oreo cookie that he had for dessert! The emblem ended up looking like an Oreo cookie with a abstract falcon in the middle! If anyone in the Forum owns a '65-'66 Falcon Sports Coupe you'll know what I'm talking about!
Bruce