I can't find any information on this microphones, I can't say they are real Telefunken mics. The Telefunken badge looks weird and not the same as all other Telefunken mics we have, and they sound good. For this reason I am selling it non working and for parts. The mic sounds good for guitar amplifiers, any source where ribbon excels. There is a forum online saying that there is a guy in Europe making this mic and selling them with DECCA and Telefunken badges. I have three of them... and I am selling one. Auction starts at 10 cents no reserve for 10 days.