On THIS site, worth about $1.5. Ebay maybe $2. Take it to the right auction and crazy people will pay $6-10 bucks.
Three vertical folds, one horizontal fold, full corners, paper is soiled but not stained, no writing on it. It's a VG/F example depending on how turned off the buyer is with the soiling on the front of the note. Most coin stores will give you $1.10-1.25 for it. Some may even deem it to be "spendable" if they have too much laying around already. Too many of the 57, 57A, and 57B series still exist and in UNC and Ch.UNC quality. Best bet would be if you have others like this sell them as a group on ebay or another internet site. Sometimes doing that you could double the face and get $2.00 for it depends on the experience level of the buyer you are selling it to.