How old are considering "vintage"? My Elna is about 40 years old. It came with a plastic bobbin, and that was what was recommended to use. However, I have found that the metal ones work much better. The plastic will sometimes not feed correctly...as if they are too light and try to pop out of the bobbin case. Never have that issue with the metal ones. I have gotten rid of all my plastic ones, with the exception of the one that came with it. I don't use it, but for some reason, I can't seem to make myself toss it either. LOL
Patti