Weird Wilson Mic

[RHartt1234@xxxxxxx]

I stumbled across this picture of Kim Wilson with a strange mic.
http://dp3.lib.ndsu.nodak.edu/galleries/bluesfest/iview.cgi?shkey=6&ikey=423&;
lv=1&size=2
Here is the index with some other angles of the mic.
http://dp3.lib.ndsu.nodak.edu/galleries/bluesfest/

It kind of looks like the Turners with the volume pot on the back that same 
guys make but not quite, and it has that strange long XLR plug.
Any guesses?
Ryan