I have Singer 15 from 1921 according to serial number. It seems that my machine has no stitch length scale next to the stitch length adjustment, so it’s it or miss. After a while, I think you’re supposed to know about where the various stitch lengths are located. However, when I swing the lever all the way up, there is apparently no reverse stitching. Does anyone know when reverse stitching was introduced in the Singer 15 and about what year would that have been? Thank you for your help.
Dr Michael J Elinski
East Hampton, NY