@Hesekiel : i sent him my movement. It's a 6498 from a Certina , Anniversary edition, Kurth Freres , 18k gold pocket watch.
Someone probably melted the case and i was lucky enough to buy the movement.
I love unitas 6498/6497 , ETA 6497-1/6498-1 , and since they are amazing tractors that can be maintained with ease for 100 years, i use them in the vast majority of my builds.
I know the " original Rolerai " if there's even a true original out there would use a Rolex 618 ( wich is actually a Cortebert 616 made FOR Rolex ) would be the ideal movement to use, but i like a more modern and reliable movement, that also has shock protection.
Not a big fan of Molnjia either ( no shock protection )...also had enough comunism in my childhood to last me a lifetime.