Hi Subexplorer
Great watch !!!! I too drink from the UG well of watches ! I try to focus on chronometre grade examples of Polerouters... They are hard to come by...
Here is my Yellow gold Deluxe bumper , even though the dial is not signed chronometre it is one. .
There are two small tale-tail signs on the movement ..that it is a chronometer.
1) the word " unadjusted " is missing from the UG signature on the movement .
2) the movement has a s/n typically only 4 digits. 




advert stating the rating certificate..
Then I came across a Steel bumper Polerouter that had the same movement 138ss without "unadjusted" and the s/n but the dial was SIGNED Chronometre !!!

I then found another example , not the prettiest but I like it !
and last but not least a microroter UG chronometre



Looking forward to seeing what your going to get next Subexplorer
Good Hunting
Bill Sohne



