the three 15 clone type posted none are the same. I'd like to see more of these.
when I bought mine there was also an other sew mor. all I remember it was the boxy style/ modern
sharon of whats posted your would be the oldest, that's going by the Bakelite feed dog drop knob and the serial number on top the bed
look at the placement of the drop knob on mine vs on joes. also the shape of the body on ours vs yours