(Funny Fin - obverse)
When I had a minute, I took it out of my pocket and I finally figured out why it looked so odd, it was a 1950 series note. Not altogether different before the last redesign, but just enough to seem funny to my eye. According to the Internet, paper bills last about 19 months in circulation. I wonder where this one was for so long.
(Funny Fin - reverse)
My kids got a kick out of checking it out. One thing you might notice if you look closely, "In God We Trust," is missing. That wasn't added until 1963.