I have been going thru the photo library on the yahoo vintage Japanese SM group. This machine resembles a Japanese badged machine due to the feed dog drop. It has a motor mount and could have been electric before it was converted to treadle. It reminds me somewhat of an early Pfaff, although those aren't badged clones.
I have seen SS machines like this set up with a treadle for leatherwork... They can't handle anything but garment leather and light upholstery though.