This newly acquired box is scuffed and smells like a tobacco tin but I find it charming all the same. I have been looking for one for ages; as many have lamented, the boxes are increasingly getting as hard to find as the watches....
My guess would be something 18k, on an 18k bracelet (these usually did not have folding clasps that ive seen), from the very late 60s through 70s.
$1600 in 1970 is over 10k in today $$. I didn't realize they were charging that much for watches back then. Seems like a fair amount of gold must have been involved.
By the way, I strongly suspect that some Polarouters were originally sold with the same UG box but without the word Polarouter printed on top. Two of my Polarouters came with such boxes, and I know another collector who has another one. I will post photos soon.
This box has been on eBay for a while now. The seller was originally selling it with a much later Polerouter Date but has now sold that watch.
The box was originally missing its interior. Although the seller has found a very fitting interior of the right size and colour, anyone considering spending this sort of money should be aware that it is not identical to the original interior.