sewnbug, This looks a lot like my recent buy of a 128 but with the regular bobbin. Mine has the shuttle bobbin. Anyway, if you go to this site:
http://www.singerco.com/support/mach.../double-letter
you should be able to get the information that you want. If you look on the right side of the page where the red column is, you can click on letters that are found on your serial number and it will take you to a new page. That is where the info. will be for your machine ... year it was made, how many were made, etc. Have fun with the newbie.