Is the bobbin winder mechanism functional on the Singer? I don't see any little arm to move the thread back and forth as it winds on the bobbin. Not familiar with this model so maybe there's something there that I don't recognize.
Does the Seamstress come with at least a few bobbins? It would be good to know you have a source for both the bobbins and needles that fit the machine. Unfortunately I bought a Minnesota A treadle with unusually long bobbins so at the moment I just have one! Using gray thread for everything 😋
Good luck! Hope you find the perfect treadle!