Well, I decided against pursuing this further, though I read a lot on Singer 66 and 99 models - so more knowledge for me!! When I came across this - I was looking for a 201. I decided to stick with my original plan. Also, I decided that I would so much rather find something that I can go and see, and that if I am patient, the right machine will come along at the right price. But it was an enjoyable read this afternoon - and now I have an idea what the 66/99 look like (as compared to the 201-301 and 15-91), so will be better prepared in the future.