The instrument
"AKG's original C1000S microphone was launched in the 1987, when existing capacitor mics were still too expensive for the majority of home recording enthusiasts to even contemplate owning one. The back-electret C1000S gave that early generation of recording musicians a taste of the capacitor microphone sound." (soundonsound)
Details
Frequency: 50 - 20.000 Hz
Sensitivity: 6 mV/Pa
Impedance: 200 ohms