Sweden: Gustav V issues of 1921-36 "clear print"...help.

Been sorting through a bunch of these (almost as much fun as Wash-Franklin's!), but kind of ran into a wall. Going through the Facit catalog I've noticed quite a few from this set that have a "clear print" variety. Can anyone shed some light on these? Is there an online reference that details what these "clear print" varieties look like? How about just a side by side scan, anyone? I've looked at so many of these under magnification that my eyes go buggy after a while, but I cannot tell the difference (if I even have any of these). I just need something to go by.

This is the Gustav issue I'm referring to.