RARE Original Unitas 6497 17 jewels Swiss movement with stud (or screw) balance wheel. Incabloc shock protection. Subsidiary seconds at 9 o'clock. Chrome finish. Earlier version of the current ETA 6497-1 movement. 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.