the latest patent date on the needle plate is 1882. It's possible that mine has a replacement bobbin winder on it. I've not looked it over closely compared with the manual to see if there were other differences.
here are two attachment cases.
I think I also have a Johnston set (comes in a long black cardboard box with metal reinfoced corners) Johnston is the company that made the tucker with the coil spring. I also discovered that the gap in the coil is what makes it line up correctly between the bed mount and the needle. I have several different coil gaps, and I thought they were from misuse or wear, but it turns out they are suppose to be different depending on which machine they fit.
Here are the quilting feet - to help "guess" at what the adapter foot would look like.
