Very cool! Did you look under the hood? That one should have a 511 (or was that 611?) Hemi in it. My guess is that the license plate is a reproduction since they guy who makes them was just out for a visit with John a few months ago. I could be wrong about that but most people don't leave real Dukes memorabilia unguarded.
Not to put a damper on things but I'm pretty positive that one wasn't in the show. I think John was stretching the truth a bit and playing to the crowd (or was misquoted) in that article when he said that is the only surviving car from the show. A few years back, Wayne Wooten from the Dodge Charger Registry organized a group buy of 17 (I believe) of the remaining cars on Warner Brothers lot. It was reported that WB kept two "close up" cars out of that deal. I just took a trip to see two others as well so that makes 21 - if I can still count at this time of day. And yes, John knows they exist since he was at the "official" release party for Lee #1.
Trivia:
The stunt crew filled the trunks with concrete during production in Georgia but had refined their technique in California and had removable weights attached to a rack that was welded into each car. The concrete in the trunk is what saved Lee #1 from being crushed in 1978. The weight was enough to buckle the rear of the car upon landing so the car ended up in a 'Z' shape (front pointed up and rear pointed down). WB wanted all of them crushed for fear that someone would manage to salvage a jumped car and put it back on the road. Later on - after the show was more popular - they even went as far as cutting off the roofs before sending them to the junkyard.
Only cars made after production moved to California would have any etched numbers. The identification would be in the format of "SGL##" and should be on the firewall and rear window.
Troy