The picture isn't great, but it looks like a model 12. It was a transverse shuttle, fiddle base machine, with a large handwheel like that. The model 13 and New Family are similar, but they have another little slide in front of the access plates around the feed. The style of the treadle irons fits with that age of machine as well. I've never seen one in person; I admire your willpower in passing on it!