I just bought one at a garage sale with the F4447192 serial number. it was "born" in 1913 in Clydebank, Scotland so I would imagine yours would be a 1924. the design is called Lotus blossum and it is a 66 model...right now I am looking for extra feet for mine. the drawers were full of needles, buttons, junk with a picture of a woman from Scotland that looked like a school picture...very interesting. Mine is not back together yet but machine itself is going to be waxed today and then moved inside. enjoy yours.