Hi Vlad! The telescope of Galileo permits to obtain a straight image bigger than the object. If you look at the other side of that telescope, the image becomes smaller. It's the principle of the reversed Galileo finder.
As far as I know, the finders of our cameras are based on that principle: to have an image smaller than the object. The most simple of all the Galileo reversed finders: the one of the Leica A or C, without any rangefinder.
So a non-reversed one would not make images smaller basically.. I see... for some reason I thought reversed meant that you can mount it either way forward facing or backward facing and it would be used for different applications...