SINGER 15-125  GEAR DRIVEN SEWING MACHINE Serial # AM620136. Made in 1956. Machine serviced and tested .Installed new external wiring harness. Has some finish wear. The 15-125 was an upgrade from the 15-91.  It is the last of the potted motor series. With the proper needle and thread this machine can sew denim, canvas or leather. Strong great working rare machine. Please see photos