Took a while but I now know that this is a 1925 "Yellow Jack-It" model 4. Yellow jack-it had a model 1 small, model 2 large and this model 4 in 1925. They may have had others, this jack may have replaced a model 3? Since my last post on this jack, it's been gone through and looks and works very well! Any old mechanical garage jacks that you would like to let loose of let me know.
