The 767-FA-373 was Durkopp Adler's top medium duty flat bed walking foot machine until they came out with the 867. Both were the best machine made in their class. Not cheap new. The one you are looking at has thread trimmers and probably most of the toys, i.e. auto foot lift, back tack speed control, high lift knee pedal, etc. I have a 767-FA-573 which is the XXL bobbin. Great machine. Smooth as hell. more powerful than the Tecsew. You need air to run the functions unless it has been stripped. Very smooth. 1/2" lift under the foot minimum. Max. stitch length is 6-10mm depending on its age. Let's see pics if we can.
glenn