Friday night I took a class with Betty Neff. Betty and her husband Richard are so very knowledgable about Singer Featherweight machines. I found out that my machine was manufactured between 1938 and 1941. This is the machine I've been using all weekend.
There are some really fun attachments for the Featherweight ... both vintage and new and LOTS of the feet and attachments work on newer machines. This is the ruffler.