Seamuis,
Not willing to part with them at this time.
Just took a look and I have six of the nine MX screens. These are the MX screens not the LX versions. I understand they are similar and interchangeable but the LX variants are said to have a different coating (Clear Brite). This evidently has a small effect on exposure if the LX screen is used in an MX.
SC1 matte field and split image spot with microprisim collar. This one came with the camera. The standard screen for use with lenses less then or equal to 300mm.
SA 1 matte field and microprisim spot. I use this for telephotos. Eliminated the blackout effect one gets with the standard screen..
SE matte filed only. Recommended for use with lenses slower than f/5.6.
SG matte field and cross hairs.
SA3 Microprisim field only.
SD1 Central cross hairs on clear glass screen. For microscopy and ultra close-ups.
Missing the SI matte field and scales, SB matte field and split image spot, and SD central cross hairs and clear glass. Never felt the need for these.
You are probably aware of this link
Pentax LX - Info on Various Focusing Screens
which describes the LX /MX screens.
Cheers
Tom G