Yes, that a radar note. It reads the same forward or backward. Value depends on condition, signatures, run amount and several other things but you won't retire on it. Always nice to find and keep.
If your radar is crisp, it's worth keeping. If it's worn, torn stained, or marked, it is still collectable IMO, but it probably won't ever be worth more than a fraction over face. Knowing this, I keep any radar $1 notes I find, but only crisp Unc for higher denominations
Hopefully Bill Spraker will post us a pic of his 19231922 so we can proceed with some confidence and assurance we've not led him astray as to any value. In the meantime here's a nice radar but due to condition not worth much more (if any) than face so it went into the "spend it" pile.
The collecting of paper money, just as with coinage, can be very subjective depending on the person collecting. In this case, if the years 1923 & 1922, or the birthdays Jan 9, 1923 or Jan 9, 1922 are significant to someone, they may find it very collectible. But for most people, that bill would only be worth its face amount. Your radar bill is significant to some collectors, & many/most consider the condition of the paper critical. If you collect for your own satisfaction, keep what you find appealing to you. If you are looking for examples to sell for profit, you must be much more discriminating. Don't expect to find many exemplary bills in general circulation, but have fun with it.
Too bad about your $20. If that was a $1 in that condition I would keep it but I couldn't justify keeping a twenty
@cpm9ball, I immediately thought of Sgt. Schultz also. The older I get the more I resemble him, including my love of apfel strudel. Steve