66s - 301s 401s 500s 501s even have 18 or is it a 185....I forget. I think I'd pick up ANY Singer if it were in good to great shape and, of course, the price was right! You never know who 'might need one'
I keep saying I'm going to start a notebook for all the machines. A notebook to list the machine, model number, serial number and manual info. ahhhhh someday when I have nothing to do.....