The world is very small. Maybe you could join one of your colleagues for the next rehearsal of the Kreisorchester in Pirmasens early april and bring the tuba with you.
As the tuba resembles the properties you would normally appreciate (taper, mensur, of an Alex 164, bore, other dimensions such as the bell and the entire instrument was handmade, 8,7 kg, presumably in Klingenthal, warm full sound, depth of color, speak, ansprache), it could be quite an interesting instrument and wothwhile to keep and restore it. Weltklang was another brand that sold this kind of tuba. Althought this name is sometimes associated with „lower qualities“, Weltklang instruments in the past have been made by the same production brigades who made the other instruments (B&S, Sonora, Gerhard Schneider) in Klingenthal, but it happended that sometimes an aprentice (lehrling), assembled the instrument, or the „right“ material was not readily available...
(Also the dents visible in the pictures can easily be removed). Question is the tightness of the valves, but if not extremely worn, valves can be nickel plated to resume tightness and hence also speak, core of sound and intonation. There is a very skilled craftsman north of Kaiserslautern who could do this.
Hope you keep this interesting piece of history and curious how it sounds.
best regards
Christoph