I went to a flea market today on the lookout for any old soda cans. There are always a lot of soda bottles, but usually not many cans. The only can I found worth buying was this Coca-Cola can. After getting home, I dated the design to be around 1970-1971 (notice "caramel colored" written under the Coca-Cola logo).
But the reason I bought the can was because of the offer on the side of it, "Can radio... yours for only $5.95 with proof-of-purchase." The offer ended on February 29, 1972, reinforcing that this can is probably from 1971-ish.
The reason I liked this "ad can" was because it's the first vertical ad on a Coke can I've seen. I don't know how common or uncommon that is, but I thought it was pretty cool.
So what did I pay for it? Well there was a plain Coke can next to this one. I asked the guy how much they were and he said, "$3 each or both for $5." I think I already had the other one, so I just wanted this one. I said, "How about $2.50 for just this one?" And he replied, "$2 and it's yours." That's the first time a seller has bid me down.