Hi, Janey, and thank you for the info. I was able to find an original manual - but haven’t finished going through it yet. I did discover that the M has to do with regular stitching, and the S is to stretch stitch (which I doubt I would ever do..). The thread take-up bar was bent and there were some other minor things, other than that it looks as if the machine was never used! I still can’t figure out the year it was made. Mine says it has the Lint Cleaner, but I don’t see any red felt on the side like that. Interesting! Thanks again for your informative reply!