Finally, I've removed the objective lens from the PST lens cell by removing the retaining ring. It's a very thick cemented doublet. Maybe I will want to buy a similar doublet to replace it myself, of course, since there's no ITF in a regular lens, I will need to install an ERF in the front as a replacement. It will not be very safe, but at least it will work for imaging.
I've also checked that the prism inside has a special coating, images through it will become red in color, so it's some form of filter as well. This prism is the one inside the black block, both for focusing and as a prism diagonal.
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