Strange Tungsram bell battery device+handset. Helps needed

[Aries22]

Hello,
seems to me like civil piece, but it was find with ww2 german stuff so I want to be sure. Thanks all for help

[kabel]

Had some problems with posting on the forum the last days, but yes it is probably a civilian set, intercom or toy, but it should be possible to get working, and some collectors will definitely love that one too.

[csmagdo]

Looks like a DC intercom to me, but what I really wanted to add is: the logo belongs as maker to the Czech Telegrafia (1919-1945), from the very end of 1945 it was merged into the 'new' Tesla (Pardubice).
Take care, Folks!