Originally Posted by
Charlee
I think you have a 1948, because it looks like a "JC" to me.
The badge on the front of the machine. Does it have a blue ring with the dates 1851-1951? That would indicate a Centennial machine. If it's a black ring, or just solid brass, it lends to the 1948 date.
Definately not a 1904 machine, they didn't have the 15-91 then.
I agree with Charlee that it looks like a C. The Singer site in the OP didn't tell me anything either, although I printed the certificate. I have a Model 15 also. The serial number was released in 1935 in a block of 35000. My father bought the machine new for my mother shortly after they were married in October 1936. How do I tell which version of a model 15 it is?