Vintage Telefunken V1140 steel tube microphone preamplifier

Incredibly rare, from the heydays of German broadcasting design.
This V1140 from the 1940s or 1950s according to my best knowledge.
It’s a relative of the fabled V41a tube preamp.
The tube complement is similar: EZ11, 2 * EF12, EF12k.
Variable gain: ca. 45 .. 60dB.