Yes that "reproduction" is terrible and its easy to see many differences
Change, by survey and examples , appear to have taken place in November 65 as to where the sticker/decal was attached.
So for your October 65 Mustang/Shelby the sticker would have typically been attached to the glove box door towards the center of the car.
Have no idea of that sticker was attached to the back of your glove box door example but its clear to see that it wasn't the tire pressure one that left that shadow
If you want more information and pictures of original stickers and their location its available below