The appropriate location for machine serial and model numbers and other info on specific machines is the top thread in the sticky area at the top of this Forum. If you wish, I can just move your post up there. When I get time, I'll add them to the database, the master copy of which is kept on one of my local hard drives. Two or three times a year, I update the copy in Downloads, and in the Files area of the Atlas-Craftsman Group at groups.io (this is the Group that used to be on Yahoo).
From the photo of the page in Frank's earlier post, it would appear that your serial number should be stamped somewhere on the left side of the machine. I am not certain what the "Left Frame Way" is, but would assume that it is one of the three (I think) ground ways on the machine, almost certainly in an area that nothing slides over.