very cool! the oldest bill I have received in change was a 1934 series $10, $50 & $100 on separate occasions.
If you know which bank you got it from, perhaps you get them to save the "older" bills for you. I have a few banks that do that for me.
Nice find, but I believe your $150 estimate is a tad high. Unless uber rare, notes just don't bring what you'd expect and what value they do have is very condition sensitive. The writing on your bill hurts the condition grade badly.
I did a quick search of completed listings on ebay and found notes like yours, but in better condition selling for less than $100. I personally think you'd be lucky to get $75 for yours.