Oh, wow, thats a pretty nice example. That dial was originally solid black and gave up a lot of her pigment due to UV light and humidity. Some collectors call it "tropical" and for some watches it increases value. Not really the case for a Polerouter but I still think it's cool AF.
The case looks pretty good.
Here's the rub: you can buy a an 18k Bombe lugs solid 18k Polerouter for like 2g's. This keeps the price of the SS watches down. I haven't seen too many sell for more than $1000 in SS and $750 is a more realistic number for a good condition watch.
How much is seller asking and is he offering a warranty (warranties from brick and mortar stores are valuable).