I completely agree regarding the date. It's clearly not from the same period as those in the pictures above. But we have seen an SAS Polerouter in the past (see below) from
@Dre that suggests that there was a relationship between UG and SAS well beyond the 1950s. In fact, his watch is likely to be later than mine.
I also agree with your comments on the applied U. The problem is that I think it's just impossible to generalise with these watches. The printing in the lower half of the dial would have needed to be bespoke because it is in the upper half on all other Polerouters. Perhaps a slightly older dial with an applied U was used and then printed for this purpose?
Mine appears to have SAS engraved in addition to the SAS emblem, which we've not seen before. It has hands of the like we've not seen on a gold polerouter before although they do look to be UG hands of the correct shape and size. I believe that these pieces were bespoke and that the normal rules simply fail to apply.
It has just arrived in the post, at least one day earlier than expected. More photos to follow shortly.
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