Yes, a 15-91. The wiring does look stuff and brittle. Even tho the outer casing may not be broken, likely the inner insulation is crumbly. SewClassic has replacement cords, as well as wire for the lamp. The compression rings (3) on the lamp are a bit of a hassle to remove and reinstall, there's a tool for that which helps immensely.
Sewing machine oil on the exterior will do wonders, as will a metal polish on the shiny bits.
With a potted motor, the grease cups may need some attention. Clean out, and replace with petroleum jelly.