I saw some posts from 1999/2000 issued by Slackmaster2K who appears to have left the forum requesting information on the Audio-Technica AT812 microphone.
Just for completeness please find below the specifications for this microphone:
Element: Moving Coil Dynamic
Polar Pattern: Unidirectional (Cardiod)
Frequency Response: 50 to 15,000 Hz
Sensitivity: -60 dB (0 db = 1 mW / 10 dynes/om2)
Open Circuit Sensitivty: 0.16mV (-76db) re 1V/dyne/om2
EIA Sensitivity: -154dB
Impedance: 600 Ohms nominal, matches 150-1,000 ohn inputs
Weight (less cable and clamp): 7.6 ozs (217 grams)
Dimensions: 7 3/4" (196mm) long, 1-17/32" (39mm) head diameter, 13/16" (21mm) body diameter.
After typing this in, I am now going to pour myself a cold beer.. cheers all