Just remember, most of the "class 15" non-Singers take a case with the finger pointing in the opposite direction from a Singer 15 machine.
From the picture, this takes one with the finger pointing to 1:00. Singers are usually pointing to 11:00 (though Singer did make some for a short time that were the other way)
http://www.quiltingboard.com/vintage...e-t236267.html