I agree. From what I saw, Heuer is the last one I know of using Fab Suisse dials(late 60s, possibly early 70s)
Just from my observations an approximation of the last use of the Fab Suisse by brand.
Longines(early 1960s)
Omega(late 1950s)
Zenith(late 1950s)
Heuer(late 1960s)
JLC (late 1950s)
Patek Philippe(early 1950s)
Brands I have never seen a Fab Suisse dial: Rolex/Tudor, IWC, UG, VC
As I said this is only a rough estimation from what I know; new facts may emerge
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