Bill,
I think that they're only worth around $10.00 but I'm willing to give you $15.00 if you sell it to me really quick! :)
On a more serious note, back when prices were outta control, I'd heard rumors of one going for $600. I've personally seen them exchange hands for around $150 - $300 however I could see how someone with an early car needing one badly enough to complete a restoration would pay considerally more for one just to finish their project.
I thought this was a good deal considering it's near NOS quality (had been of the car for a very long time). I've had a couple of guys tell me that they took them off their cars and replaced them with the newer style badge years ago since the newer style stood out more. With this said, it wouldn't surprise me if there are more sitting around on garage shelves somewhere.
Chris