It's not uncommon to see Polarouter cases with Polerouter dials. I had initially assumed that these were Polarouters where the dials had been replaced at a later date but I am beginning to wonder whether there was one or more batches that left the factory this way. Firstly, I think there are too many of these watches for them all to be dial replacements. Secondly, I've found multiple examples where the watch is in good condition and has retained its original crystal and original crown and it therefore seems less likely that just the dial would have been replaced. The watch pictured below is a good example. It has a Polarouter case, identified by the six key case back and the 20217-5 case reference (not S20217-5 as you typically see on a later Polerouter). It also has the original signed crystal and the original signed crown that we would expect to see on the later 2nd exec Polarouters. However it has a Polerouter dial - the dial from a slightly later S20217-5 Polerouter (note that it is the dial from the equivalent reference with silver dial and lume i.e. the 20217-5 v S20217-5). The serial number is 1'684'708. Whilst this theory may not seem totally implausible given that Polarouters were only produced for such a short period, I should point out that there are Polarouters with later serial numbers that have Polarouter dials. If my supposition is correct, this would mean that the watches were prepared in batches and not in serial number order, which doesn't seem impossible. Whilst it will be difficult to prove that these 'transitional' watches are all original, if we could find a number of similar watches with serial numbers within a narrow range then I think this would make it more likely that these watches are all original having been produced in the same way at the same time. Alternatively, if we found lots of 'standard' Polarouters with Polarouter dials with very similar serial numbers then that would make the 'transitional' theory less plausible. If anyone owns a watch that is potentially a 'transitional' model or sees one, could you please either post pictures and the serial number here or send the details to me directly?