I have been talking to a lady that has a treadle machine for sale. She says it has the model #H362638, when I look it up the number shows it is a Model 15 made in 1906, do any of you have this machine? I wanted to see a picture of it before we drove several miles to look. I am confused because I thought all machines made that early had the long suttle, the picture I found shows the class 15 bobbin on the side like the 15-91 electric. Any thoughts on this?