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If your machine is the 3/4-Size model with the 12 to 13 inch Bed (30cm to 32cm) then you have the Model 28.
You most likely have a Model 15 Series machine but there are several styles which we now have to determine.
Now open the slide plate and look at the Bobbin Case.
Locate the Bobbin Position Finger and note in which direction it is pointing.
Check to see how your machine is powered and choose the answer that best describes how your machine is powered.3. Check to see what drives the machine as it may be Belt-Driven or Gear-Driven.
You have indicated that your machine is Electric Powered. Is there a RUBBER BELT that connects the motor to the Hand-Wheel? You have indicated that your machine HAS a Rubber Drive Belt.
, you have a Singer Model 27 or 28 or one of their variations such as the Model 28K.