Now, I’m now 100% sure if this is the exclusionary rule, but it would seem like it (I wasn’t told specifically what the reason was so have to infer).
“Movements or cases sold separately are not eligible”.
As far as I’m aware, VC never sold cases or movements to end customers. Therefore, what i presume the rule refers to, are design or case manufacturer customers (such as Verger Freres in Paris or Perrin in New York), who acted as production intermediaries outside of VC’s own production.
VF and Perrin watches have their own case number designations.