Well, that all sounds like a Fine Fantasy Tale, but the Belgian Tubeset Schaefer sourced did pass thru the Liége Proof Facility.

We have hashed out similar before & I think it comes down to the Patent Protection Period for the country of use.

S,D&G / Daly / Lindner waited till about 20 years before they ceased paying for the APUN thru Francotte. And the German makers waited a little longer extinguishing about all other platforms before they settled on the Anson & Deeley Body Action, other than a true sidelock. Now I am just not sure if the wait was for Daly's end user for the Patent Protection Period, if was where it was manufactured or where the APUN was paid?

Now Daly did bring the Anson & Deeley Body Action to Suhl and Lindner took it to the PInnacle of Perfektion. It was only then that other Suhl makers began to adopt it as the preferred platform. Then the Kerner - Anson became the staple.

Hochachtungsvoll,

Raimey
rse