I made a purchase this weekend. Found it in an out-of-the-way antique shop in Missouri. I'm sure it is a class 15 Singer, but which exact model I am confused. According to Sandman collectibles it is a 15-30: electric, belt driven, tension on the face plate facing to the left, and the finger on the bobbin case is pointing to 1 o'clock. BUT as I scrolled down the page I found a picture that looks exactly like my machine - a 15-86 with the RAF decals. And then at the ISMACS site it says that my cabinet was only sold with a 15-91 head. So not sure what I have. It is in great shape except for the wiring. DH has been working on that today. Only paid $20. And I think the attachments for my modern Singer will work on it. Can't wait to try it out.