Thiele microphone brochure

Thiele M5 tube microphone
Here’s a scan of a short advertising document for Thiele M4 and M5 (photo to the left) tube microphones. 

Theile sales document
Note how expensive the microphones were at the time – 500 and 600 Deutchmarks. For reference, between 1950 and 1960, 4 Deutchmarks approximately equalled 1 US dollar.