Ok, I'm going to let out one of my hunting secrets here for you all. I've been looking for another Shelby helmet for a while now, and I realized that they don't have any permanent markings on them telling everyone what they are. When they were new, they only had a single Cobra sticker on the front, which was easily lost to time. I figured that many of them might be sold off without the seller (or even the buyer) ever knowing it was an original Shelby helmet. Inside they have a certification sticker saying it passed requirements set forth by Snell, and the large '1968' is obvious.
The biggest give away are the vents on both side just below where your ears would be, and a stitched leather boarder all around. I just picked this one up online.
At some point in history, it was repainted and goofy stickers were added. But those ear vents just screamed 'Shelby', and when I compared the inside straps and number of snaps, it was apparent this was originally one of the Shelby helmets.
Gotta love the "Ride beside me, be my friend" sticker.