Schaub-Lorenz bei Techmoan

In a recent video from Techmoan I saw a familiar logo on the PCB of an STC Executel. You can see the logo in the video here. In the upper left corner you can see the logo and the number "8413". After some brain storming and searching I found out that this logo belongs to Standard Elektrik Lorenz AG (SEL) who sold their consumer market products under the brand name "Schaub-Lorenz".

In the video Techmoan explains that the telephone was made by Standard Telephones and Cables (STC). Now I wonder if it was actually produced by SEL. STC and SEL were both part of International Telephone & Telegraph (ITT). Bye the way, Techmoan showed a Schaub-Lorenz logo already before in a video about a Hi-Fi system. You can see it here.

Update:
I found on Binary Dinosaurs a picture of the package for the Excecutal that has a label from SEL.

The original version is here.
And here is the address on the package.

Standard Elektrik Lorenz AG
Hohenzollernstr. 16
Entrance Wittelsbacherstrasse
7530 Pforzheim
West Germany