I've actually decided to invest in a steel stamp, with which I can punch in the word "REPLICA 2011" in about 2 1/2 by 1 inch size. I'm thinking twice on the back, one to either side of the number, should be sufficient without affecting the display characteristics.
I do realize I was being quite absolutist (thanks Tara!) and while this won't do much against the hardcore counterfeiters, it will dissuade at least a portion of people looking to make a casual buck.
