You know much more than I do about these things, but I get the impression that in the US, any clarinet that isn't Boehm is called Albert. What about Oehler, this looks really close to my son's Uebel Oehler. And his older/simpler Uebel Oehler with fewer rings looks similar to what you also call an Albert. (And yes, I do know that Albert/Oehler both came out of Mueller, as did other less common German system clarinets).
