For a little background on the model 15’s history, my research reveals that it was first introduced in 1879(?) and remained In production for over 100 years. In fact, the Singer model 15 sewing machine was the longest manufactured machine in history. It is also the most copied sewing machine in the world and clones are still manufactured in India, China, and other countries today.
it is an icon that holds true to its reputation as a fine straight stitch sewing machine.
The model 15 was manufactured as a treadle, a belt drive external electric motor, or a gear drive potted motor. This machine is the model 15-91 that features the gear drive potted motor.
Singer only offered a gear driven potted motor on three models throughout it’s domestic sewing machine manufacturing history, the other two being the model 101 and the model 201.
The most significant difference between the model 201 and the model 15 is that the model 15 uses a vertical bobbin and oscillating hook, in contrast to the model 201 which used a horizontal drop in bobbin and a full rotary hook.
The feed dogs are lowered by loosening a screw below the machines bed.
The bobbin is a class 15 and it uses a standard 15×1 needle. The needle threads from left to right.
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The Singer Company first started production of its oscillating shuttle, high arm Improved Family machine in 1879.
It was designed for domestic and light industrial sewing and came mainly fitted into treadle tables or cabinets, with just a few supplied as hand crank machines.
Some of the earliest models had a fiddle shaped base with the serial number at the back and used a 'long beak' shuttle.
In 1895 the Improved Family machine was mechanically altered and the appearance changed, and so the Singer 15 was born.
It was to be the most successful sewing machine design ever, remaining in production for over 100 years, although it did undergo several improvements during that time.
The original Singer 15’s, like all the other early domestic Singer machines came as the usual treadle or cabinet versions or as a hand crank model.
Later models were either electric or hand crank machines.
With the class 15 Singer introduced a new design of needle with a flat on one side of the shank.
This was given the designation 15x1.
This design became pretty much the standard needle used not just in most future Singer domestic machines, but also those of virtually all other makers.
Under more modern classification systems the same needle design is also known as a 2020 or 130/705H
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