To my knowledge, the GALILEO was made in two versions, one having the rolling wheel on the clip and the other having a plain flat clip .
According to Tom Westerich site, penboard.de, a set of 35 non numbered Urbano LE were made for the German market and another set of no more than 50 were made for the US market .
Heres a transcription from penboard.de :
OMAS POPE URBANO VIII
This Edition was made for the German market in 1999 as an Edition of 35 pieces only. They were delivered not numbered. Another very small quantity has been delivered to the US marked, but the overall production did not exceed 50 pieces. The round shape follows the historic design of the Omas pens of the 30ies. It is named Urbano VIII after the pope, who put Galileo on trial.
The facetted pen (12 flat surfaces) honours the man who declared the world a round thing - the round version honours the man, who did insist the world is a flat thing, Pope Urbano.
There is a photo over FPN where you can see a GALILEO with a flat and plain clip, heres the link: