Original Warmink sawtooth or gravity clock clockwork. In excellent running condition. Complete with pendulum and hour tube. IMPORTANT the clockwork is 2″ or 5 cm tall, if you need the 6 cm version we also sell that in our store. They are not inter-changable. If you like you can send us your old clockwork if it is complete with pendulum and hour tube, you can return that to us for a refund of 50 us dollar plus shipping.