I haven't heard Sardinian briar praised in particular, but it may be a premium briar. I think Italian briar is considered good. Algerian briar used to be extolled as premium, but I think the sources were reduced or eliminated by political struggles. Since brands were not specified, I suspect this lot was not expensive. Briar harvesting is hard labor.
I trashed two of the pipes.one was made of wood and not worth the effort to clean up and the other had as much filler in the finished surface as it did briar!
The two that are stamped “Sardinian Briar” were a Paronelli and a Casta Bardo.
The rest included a Calabresi, a Jobey, a St. Ives and, of course, the Calabash.
No maker’s marks on the other two-
one was lightly used and only stamped “ITALY” It looks like a Cassano Mare except for the black mouthpiece.
The last one was obviously a favorite- long and lovingly used to the point that the makers’ stamp and any hallmarks on the wide silver band were worn away.
I’ve tried them all and am very pleased with them.