I have tons of sewing documents stored on my computer including the dates and serials for the Singers, New Home, Kenmore sewing machines. I also have service manuals, parts list, owners manuals, instructions for attachments and so forth.
My Data base is a little more complete than Singers on the dating and production totals but you can go here for the information:
http://www.singerco.com/support/serial_numbers.html
Billy