It's not a 15-91 clone, cause it has a belted motor. So that's a 15-88? Or something like that.
Diana! Cute.... I remember seeing a Diana on a craigslist somewhere. I bet it will sew a nice stitch and looks to be in great shape.
You know, I never thought to ask anyone this. Will a Japanese 15 clone fit in a regular Singer cabinet? Or are the bolts in different spots or something?