Erdsprache FF33 version?

[Admiraal]

I bought this strange looking FF33, but am not sure what it is, any idea?
A friend thinks its the "erdsprache" version, that it has something to do with that earth stake that signal people had.
But another friend thinks its a wwii housing with post-war inside.

Well i don't think its post-war, because it has some "extra's" in it that post-war phone's also havn't got, afaik.

Photo:

[François B.]

That's definitly not a Erdsprech-gerät.

Looks to be a post-war telephone, East-German or Czech, better pics would reallly help......