So we have found the issue with the seatclamp, apparently this seat tube has been cut at some point in its life and with the current seatclamp it would require two holes drilled to attach the current seatclamp:
He was selling for his friend, tbh, with this frame if I am going to keep it forever, then probably the first option would be more ideal, but the thought of drilling into the look frame is a step to far for me and the mechanic...
So we have found the issue with the seatclamp, apparently this seat tube has been cut at some point in its life and with the current seatclamp it would require two holes drilled to attach the current seatclamp: