Cobra Valve Covers

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Admittedly, I'm going to sell these, but need to know if there is any difference between the '60s made and newer made versions of this cover. I bought these from my neighbor ( a non car guy ) who said he bought these in 1967 / '68 for his '66 fastback. He said he got them at the local dealer. I have no reason to doubt him. I've known him for nearly 30 years and he's never had anything more than an old pickup. Anyway, it looks like they may have never stopped making these. I know the Buddy Bar units are the most wanted and these have no makers markings or part numbers. Can someone give me an idea what I have ? Any value or hang them on the wall ?
Thank You !
Dave