French 25x198R APX

When the French 25x194R Hotchkiss AT gun was under evaluation the military arsenal at Puteux was competing with it’s own design which was very similar in layout. The cartridge there, also similar, was a 25x198R.

If I got it right Woodin lab had a sample of this round.
Did back then somebody take images of that round maybe?

Or are any primary source documents on that one available?