My colleague bought a radio receiver, which is a big mystery for me. It looks like a genuine WWII Luftwafe/Wermaht equipment but probably it was modified by someone (radio ham??). However, I can not be sure if it was modified, as inside all parts look to be professionally assembled. Has anyone ever seen such radio? Can you estimate it's value? I did not find too much about it on the web just below two links.
E502F Receiver-C Telefunken Deutschland TFK, Gesellschaft fü
...Although it does not look exactly the same...
On Antique Radios, 266 578 Antique Radios listed there is a note that such receivers were also for commercial and amateur use, although this radio looks very robust. This suggests rather military design.
All hints, theories will be appreciated.