Very interesting site! Things are not matching up though for me to figure out the date my machine was manufactured. I have a 15-91. When I bought it, the seller indicated it was made in 1951.
According to the link posted by the OP, when I put in my serial #, I am told my machine was made in 1904. Hmmm - way off the date given to me by the seller. So I go to the Singer website. Again, info isn't matching up. My serial # looks to be J0851326 (pictures posted below). Could be JO - but when looking at the serial number charts where 2 letters are used as the prefix - there is only JA through JE (JA - 1924; JB - 1936; JC - 1948; JD - 1951; JE - 1961). Doesn't look like a JD to me (that would match the year I was told the machine was made). If looking at the list for only a single letters as a prefix - still not a match (J1 to J885.839 - 1904; J885.840 - J1.905.204 - 1905).
Am I supposed to ignore the 0 when looking at the serial number? So that it would be J 851.326 (going by the numbering style given in the list with just a 1 letter prefix)? Am I looking at the right thing even, or is there a number on the machine elsewhere?
Also, the machine was made in Canada. Tried googling all of this - but everything leads to these same sites for identifying older singer sewing machines by their serial number.
Can anyone shed any light on this?[ATTACH=CONFIG]306993[/ATTACH][ATTACH=CONFIG]306994[/ATTACH][ATTACH=CONFIG]306995[/ATTACH]