As someone who runs two reference websites (
gmtmaster1675.com and
explorer1016.com ) I say on several pages that all the serial range-dial matches are empirical, a best guess based on what I and others have seen, correct watches can definitely fall outside the ranges, etc.
I think there's reasonable scrutiny for something that lies far outside what's known versus something in the penumbra. Given how poor dealers are and "noticing" when a watch is put together, I think these dogmatic sites have done far more good for collectors than evil, but thanks for your nice comment.