ROW (this example from Italy) looks like a zero finish - or possibly even a gloss varnish finish - on this cool artwork and all the better for it.
Also looks like metallic reflections which contribute nicely to the dramatic and well balanced artwork.
Pics courtesy Steelbookpro:-
vs. US steelbook = (streaky) matte finish.
Perfectly in keeping with the previous three in the saga . . . making for a great looking matching set of four steelbooks (apart from here w/ a most unfortunate spine slash on ANARCHY) :-