Serial numbers for Singer Featherweights are located on a raised boss on the underside of the machine. Lay your machine on its back and look on the left hand side of the main body (not the folding extension table).

Where is the serial number on my sewing machine?

The number can be found near the on/off switch on newer machines, and on the front panel or on a small plate on older machines.

Where is my Singer serial number?

Typically located on the right hand side on a small plate on the front of the machine.