I thought it was mounted backwards when I first looked. Now that I look closer it looks as though you have a four point mounting system and the three points are at the throat. Clearly upside down.
The top clamp looks like the old Prince clamps. Is there a P on the knob? Also your fixed clamp is backwards but if it stood straight up you could clamp the string. It could be you have several parts from several stringers.
Appears to be a good stringer to start with.
I would like to apologize to anyone I have not offended. Please be patient I will get to you shortly.