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There is no reference charts available to tell us the exact model number from it's serial number.However hopefully this page will help identify your sewing machine model number in conjunction with the other details we have available relating to sewing machine serial numbers..!The slide plate (to access the bobbin) had a small oblong hole which aided whilst sliding the slide plate to the left to view the bobbin.This image shows even older antique Singer machines dating from way back to 1865 to 1870 with a fiddle type bed.
The Aluminium body machines were made in Black/Gold, Beige or Beige/Brown.
the long bobbin/shuttle was inserted into its case which looked like a bullet, then the case was located into the machine and lay in a frame that looked like a boat hull.
When the machine was running it most likely was quite noisy because the shuttle moved forward and backwards at great speed, at times it made the machine vibrate.
The Singer 99k sewing machine is small in size measuring only 12-1/2" wide, this image shows an early version the 99K (99K21 - 26) made between 1924 to 1954. The stitch length was adjusted via a screw and the machine did not stitch backwards.
Later versions 99K31 had a stitch length up-down lever with reverse stitch and numbered tension dial - Year 1955 The Singer 15K is always recognised by its tension unit being on the left face of the machine.
Its manufacturing year was 1955 to 1964 The Singer 66K is the large version of the Singer 99K.