Here is a picture of an original paint 49 GMC.
49 GMC Pinstripe As you can see, it definitely looks hand done and not all that professional. Here is also a picture of my 52 GMC I just finished. It looks a little better than the 49 but still hand done. Notice that the stripe is not centered on the belt but about 1/3 the way up.
52 GMC Pinstripe