Well, I had to look very carefully but I am positive that I have isolated the problem to T1 that needed a bushing. When the clock stopped T1 and T2 binded twice at exactly the same place. I know this from making marks on the wheels. T3 and T4 moved while touching them with tweezers. The worn pivot hole only became visible from the front of the plate. I guess it is very important to inspect pivot holes from different angles!
To answer your question, it is a time and strike movement. It is unmarked.
It is still possible that there might be another problem causing this, but for now it is time to be positive.
Thanks for your quick response.