That's a much more "correct" looking example, in the UK, for under 10k. No box or papers, and no way of knowing from a C24 ad how much of a bitsa it is - the pics aren't really even good enough to see if the dial and hands are relumed - so it's still probably overpriced but it's an awful lot better than that W*tchfinder piece.
By way of comparison -
https://www.chrono24.co.uk/rolex/rolex-gmt-master-ii-coke-16710---1993-tritium---unpolished-40mm---serviced---rare-vintage--id25922022.htm
That's a much more "correct" looking example, in the UK, for under 10k. No box or papers, and no way of knowing from a C24 ad how much of a bitsa it is - the pics aren't really even good enough to see if the dial and hands are relumed - so it's still probably overpriced but it's an awful lot better than that W*tchfinder piece.
Alternatively, a far better condition and much more honest-looking late model SEL 16710 at the WF end of the price spectrum (and again, I'm not saying it's worth the asking price, just for comparison): https://swisswatchtrader.co.uk/products/rolex-gmt-master-ii-16710-coke-bezel-for-sale-2007