I just came back on the forum. Life has been in the way. This Singer being discussed was made in Germany in the early 1954-55. It should be a model 215. It's stitch forming mechanism (bobbin and hook) are of the class 15 design, even though the tension is not on the side like most class 15s of that era. I would call it a 15. This model was not sold in the USA.
Cathy