This is a Featherweight and although it is light only 11 lbs., it is not called a lightweight. Your Featherweight looks great but there are several clues about this machine that makes me think it is from 1957 not 1947. You could find out for sure by checking the serial number against the official Singer list which will tell you when this machine was made. Yours says 221 on it and earlier models (before 1956) did not include the model number. Your machine also has the newer throat plate with the marked seam allowances, the newer style decals (after 1955) and the striated (striped) face plate. I hope you are enjoying your great little machine.