You mean this effect?
That's my gen 16710.
It's the lack of AR that creates the effect. I can assure you, the WM9 dial is exactly like the gen.
The only way to call the WM9 out (for a hardcore Rolex expert) is to take it off, handle/examine it carefully and compare the bracelets. Gen is smooth as butter (as you know). The rep bracelets never quite feel the same... no matter what mods you do on them. It's a mystery that remains. Visually, it's nearly perfect in every sense.