Hello Franck! As it was said above Polarouter was the original name of this famous model.
First series of this coveted model was called Polarouter and its movement was powered by a full size bump rotor. The famous micro rotor was introduced a little later with the change in the name. This example in my collection was retailed by well known wat...
What a wonderful example you have here, Abel!
Polerouters and vintage UG in general deserve all our focus as we do for vintage Rolex by the way. Thank you very much for sharing this pépite, Franck