I found this reference to a Dan Armstrong with a very high serial number on the Guitar Site web site. It was posted ages ago, but if the serial number is correct then this is probably one of the very last production DA's ever built...
"DAN ARMSTRONG PRICE AND AGE????Posted by JOHN MCCUTCHAN on Mon, 10/23/2006 "
"GOT A DAN ARMTRONG LUCITE TRYING TO DETERMINE YR AND VALUE ANY IDEAS ANYONE??? SERIAL IS A2813D??"