As a featherweight owner, I don't believe that buttonholers ever came with the machine as a standard included regular attachment. They were always something extra that the machine owner would need to buy separately. The buttonholer that you have is just a regular Singer buttonholer for a short shank machine and would fit any Singer that fits this description. I use this same buttonholer on my fairly new Janome because I don't like the built in buttonholer it has. My ancient old buttonholer that is older than I am is now making perfect uniform buttonholes while attached to my almost new machine. Singer also made other attachents for their machines. My featherweight came with the zig zag attachment which screws on the same way as the buttonholer. As for your faceplate, it probably got switched. My 1948 featherweight has the older style Eygptian scrollwork design on the faceplate. Sometimes featherweights were also released much later than they were made or some were made using up parts.