Originally Posted by camin
I just purchased the same machine. ...So what's the verdict? 15, or 66?
It's definitely not a 66. The tensioner is on the left side of the machine.
It's either a 15 or a 115. Either way, your machine will take class 15 bobbins and standard 15x1 needles. (also called HAx1, 2020, 130, 705 and several other names)
The free online manual for the 15-30 will be close enough to help you get your machine sewing, even if it's a 115. :)
http://www.singerco.com/uploads/download/34_sm15.pdf