Due to the condition and especially the writing on the note, I would have to say the note has very little collectable value, and worth face value. If you are a collector and just starting out, this is a great note to start your mulit-colour series with. If you found it, it only cost you $50, and you can always use it to upgrade to another one in the future, or if you really need milk money, you won’t feel bad spending it.
Cheers