Originally Posted by nett2

You may be right Billy. On the wheel it looks like there's a place for one of the treadle belts but at the same time it's in a case that has a top that looks like a mailbox. Do the 66 models have a bobbin that drops in without a removeable case?
I was on a site last night that ask a lot of questions and according to the answers it told me it was a 1910 model 15 (I can't find the darn site again) but today I find a site for serial #'s that says it's a 1920 and maybe a 66. I also found a site that said the 15 wasn't made after 1898. How can a person know for sure what we have?
How do you change the stitch length?