In the first photo, the far left shell and the 3rd from the left are the ones in question.
The first one is marked R. PINTO on the head and has a cork top-wad and filler wad. The very clear plastic shell shows the nickle-plated shot very well too.
The 3rd is simply marked IRLEC 12 and has been identified as a modular, French made shell. For me the most interesting thing is the crimp. There does not appear to be any seam on top of the shell, but there is a line around the radius of the shell just below the rim of the mouth.
Here’s a poor scan of the headstamps and a drawing to clarify.
I would appreciate anything anyone can add about makers and construction of these shells. In particular, why they used cork on the Pinto and how the IRLEC case mouth was closed.