Aaack! Joe and Bud, you beat me to the punch.
Dave Dahle [watthourmeters.com] may be able to narrow in on it. My guess it's a 2-stator 3ø 3-wire meter.
http://www.watthourmeters.com/generalelectric/d3.html [This message has been edited by Bjarney (edited 07-24-2003).]