This is an Omega half-rotor watch (circa 1950?). It has the distinctive, ticking sound of a half-rotor winding. I purchased it 20 years ago and used it actively for a long time, but I'm selling it now because I've started using other watches. It runs, but there is a time difference, so I think it needs an overhaul. I remember the last overhaul was in 2020. (Before that, I had it overhauled every 3 years.) Please consider the condition of this antique watch as a reference only. Also, please consider this item with the understanding that it is very old.