Without this edition, eighteen of Shakespeare's plays...

Without this edition, eighteen of Shakespeare's plays including some of his most famous like Macbeth, The Tempest and other plays would have been lost for all time. It's the only surviving source for eighteen of Shakespeare's plays. With regard to this particular copy of the first folio, it's remarkable because it's preserved in it's original seventeenth century binding. There's no other copy in the world in private hands preserved in a seventeenth century binding complete with all it's text leaves.