I just went down and looked at my frame. The serial number starts on the chainring (right) side of the seat tube about one quarter of the way down from the second top tube. After the serial number, more to the left side of the seat tube, is a space and then the two digit number 84. I read somewhere that that is how Snyder identified the manufacture date. Also, I just got a book about Rollfast off eBay that was sold by the CABE and in it is a sales brochure for the 1949 Rollfast model #2491 (the undressed 24” boys bike) that looks identical. Anyway, let me know what year yours is! LOL. I appreciate you looking. Muji