Unitas 6497 skeleton movement. Incabloc shock protection. Rare skeleton version as seen. Earlier version of the current ETA 6497-1 movement so it has a pallet fork cock instead of a bridge (circular, or semicircular in the best skeletonization of the ETA movement) which looks much better looking through the movement. Comes with stem but no crown, hard to see in the pictures. This is a 2 hand movement (the subsidiary seconds bit (pin) of the 4th wheel is short so you can't put a small seconds hand on it (of course, the 4th wheel may be replaced with a standard one). Not an asian knock-off. Running strong. Servicing is still strongly recommended in spite of it running well as I don't know its history and it hasn't been serviced recently. If in doubt, ask me to measure the balance amplitude and I can do that.