It has the red eye decals on it so it is a model 66. They take class 15 bobbins and use the 15 x 1 needle system. I have a red eye treadle which was built in 1923. It does stitch beautifully, but it does also take a bit to get used to treadling. I've had the machine for a couple of weeks and am just getting to the point where I am not breaking thread every time.
Shari