I was aware about the polerouter-site and even have the app on my smartphone but I found it very, very difficult to determine the originality of a certain model compared to a Vintage Rolex for example.
But I have nevertheless found a new obsession, I am thinking about buying the Polerouter book from Willis/Mazzucchi as well as acquiring more Polerouters in the future. You are right about the rising prices compared to some years ago, but IMHO the value for what you get is still very good compared to a Datejust for example.
On the other hand, the spare parts availability is much more of a Problem with UG, one quick search on C24 or ebay and I get a staggering numbers of many different Rolex endlinks for sale. Now that I am looking for endlinks for this specific bracelet/case configuration - nothing. Not a single one offered anywhere... But this makes the "hunt" a bit more exciting, I like it when I have to "work" a bit for some parts to make a watch all-original again, it is all part of the fun for me.
You have a nice Polerouter here BTW, the dial is very patinated, but other than that it seems to be in good shape. Wear it in good health, these are very special watches!