The watches that I have concerns on are the ones below. But this is not the first time that I have seen these debated, and given that its Heuer in the 1970s that we are talking about, I'm always cautious to label things as "fakes".
Many of the designs with question marks over them from this era come with "Chronographe" and "Incabloc" text in the dials. And they almost always use the Valjoux 7733 manual-wind movement, which does indeed have 17 jewels and incabloc shock protection.
At various times I have looked into these dials and cases and each time I find the most likely explanation is that they are not genuine- the only one below that is recognisable is the Black PVD with yellow- in this case, it just looks like someone has modified one of the French made 7765 Valjoux models.
I'm always open to new facts showing otherwise, but I haven't seen any evidence that positively confirms these ever left the factory as genuine Heuers.