In Captain America: The First Avenger, we see that the shield (in unpainted vibranium) was manufactured with concentric rings that line up with the red and white stripes, but no sign of the central star.
But in later appearances, we can see that the outline of the white star, along with a less prominent inner outline and five radial lines within the star, is embossed or engraved into the shield as well.
Was his shield remanufactured at some point with these new features? Was this before or after he was frozen? In the best image of the shield that I could clearly identify as being from TFA, it wasn't clear whether the lines were present (it's a bit blurry - if they're present at all they seem less prominent than the concentric rings):