15mm would seem like the truth.
GEN 1312 (p.9010) type models are declared as 13.2mm.
In most articles, similar solid backcase models such as the PAM2392 and the announcement PAM1393 are specified in the same thickness.
Theoretically, their thickness can be slightly lower, well, by 0.5 mm due to the solid backcase, instead of transparent, but not a fact.
Models rep 1392 v6f at 7750 with decoration for p.9010 were about 15.5 mm.
In theory, a VSF with a P.9000 clone could be around 15mm. I would not count on less.
But until someone buys it, does not receive it, and does not post a Photo of measurements, there is no information.
I'm just trying to offer a theory for adequately shaping expectations, in the absence of facts.
Due models with a completely different case and construction from VSF are about 13.5mm, this is the best they could show with the P.9000 clone, and I would not expect this thickness from the 42mm 1950, in the VSF version.