The decal was only used on the Plymouth ones.

There is a '67-68 one that looks almost the same but was not chrome from the factory. See below. You can easily tell them apart by the diamter of the center cone where the wing nut goes. And also the clearance dents for the a/c and wipers. I'm only telling you about it because some have been chromed by owners. As for value, they can be $400-500 for mint condition ones with perfect original chrome. Missing the base plate and having the holes hurts it. Here is a link to my air cleaner page where you can see the correct base for the 426 one. http://www.nicksgarage.com/aircleaner.htm#110

Here is the later one.