You don't really get much for them, the exceptions are comlete machines in flawless nearly new condition. On the other hand, 66 is a nice machine to work on and I can't fault it very much. But you are right Cari, the only model I can thing of being made in higher numbers are model 15, it was in production for even longer. Counting copies and derivatives of it, I guess no other model comes closer. Like with most vintage machines, the best deal is for those who fix them up and use them. They can be superb machines for various jobs.