They're really cool, I collected a bit in the mid 80's, having slid into it from collecting RC cans when they had baseball and football cans. I think a lot of what was made maybe mid 70's until sometime after I became inactive in that hobby got saved in pretty big quantities.
I bought a biggish collection with a friend of mine, and we split it. Tried selling them on Ebay and didn't do well at all. Sold maybe 10 out of a couple hundred. Figured it wasn't worth the time and put them up in the attic along with my other ones. The sports ones went in with the other sports cans.
I've seen some of the really old ones sell for really interesting prices. A clipper beer conetop in nice condition went for 10,000. I saved off the pictures...
Nice looking can, and I guess it must be rare too.
Steve B