The one in the light colored base appears to be a 15-90 (external motor) and the one in a bentwood case is a 99. Both appear to have Centennial badges, which means that they were built in 1951. From my understanding there were some machines that had Centennial badges that the serial number actually was for a 1949 machine. I think I remember that there may have been one that had a 1952 serial number.
They say that the 15s are good for FMQ and is a full size machine. The 99 is what is considered a 3/4 machine, meaning that the distance between the needle and the pillar would be shorter than a full size machine.
Janey - Neat people never make the exciting discoveries I do.
Last edited by OurWorkbench; 03-28-2021 at 02:10 PM.