What I like most about jeff. nickels: You can tell from a mile away if they're of numismatic interest. Usually you can tell a war nickel or a pre-1964 nickel from the high relief, the wear pattern, or the toning.
I saw one sitting in my dad's pocket change. I knew it was special, picked it up and was a little sad it was a 1969. But happy to see the "S" under the date!
I always treasure an san fran. minted coin I find in circulation. Cool beans.