Probably Beyer M 80 HN
Dynamic Moving-Coil Microphone
Frequency Response 50 - 16.000 Hz 
Internal Resistance: 200 Ohm and 80 kOhm
Sensivity: 0,18 mV/µbar at 1 kHz
Size: 32 x 32 x 131 mm
  1 1/4" x 1 1/4" x 5 1/8"
Original Price: DM 88,--
Introduced ca: 1966

 

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