he has identified this model as the "Half-Boehm" clarinet.
Oscar further went on to say
The fingering is Albert but the clarinet has the alternate keys for the little fingers like on a Boehm. The German jazz clarinetist Peter Strohkorb who emigrated to Australia some decades ago played this type of Albert clarinet; he could only play an Albert with the Boehm key arrangement for the little fingers as on a Half-Boehm clarinet one need for fingering an E or B1 only one little finger not both little fingers as on a regular Albert clarinet.
Oscar's website has great information for Albert clarinets
The source of Oscar's information was Mr. Eberhard Kraut, which he asked me to provide.