Allen,
for each tour there are approx 2000 Lithographs produced and they portray Mark and some of the guitars he has used for the last album. Each one is actually 'Handsigned' (not pre-printed) and numbered by Mark himself. They come in an envelope which again states the number in total and the numbered editon you have.
I guess to the likes of me who like collecting 'collectible' items to do with Mark they are 'the law'. I guess thats why I have the three MK Strats because a) they are a wonderful instrument and b) in time they will become very collectible!!