Description from the suntup website

Approved and authorized by Laurence Hyman, Shirley Jackson’s son, the Limited Edition of The Haunting of Hill House is presented in two states: a Numbered edition and a Lettered edition. Both editions measure 6” x 9” and feature six new black & white pencil illustrations by Stephen Gervais as well as one full-color center spread illustration. Stephen’s critically acclaimed work includes the Donald M. Grant edition of Christine by Stephen King.

The editions include a new introduction by Ruth Franklin, author of A Rather Haunted Life, the award-winning biography of Shirley Jackson. Both editions feature reproductions of sketches by Shirley Jackson, entertaining and enlightening readers as to how she saw Hill House as she was writing it. The editions are signed by both Stephen Gervais and Ruth Franklin.

The lettered edition is limited to 26 copies for sale, lettered A-Z. It is printed letterpress on Mohawk Superfine and is a handbound Bradel binding. The boards are covered with black Canson papers that are hand stamped with ferns in multiple iridescent colors, then marbled using a traditional small stone pattern. The design is an homage to the classic 1st edition dust jacket art by the famous book cover designer Paul Bacon, and is made exclusively for this edition. The spine is bound in leather. The book is housed in a custom handmade clamshell box, featuring wood grain paper and a brass key escutcheon.

One PC Lettered edition of The Haunting of Hill House was part of the "Brass Key contest". All orders received for the NUMBERED EDITION of The Haunting of Hill House were entered into a drawing. One order was chosen at random, and was shipped along with a solid brass key. If you got the key, you won a PC copy of the Lettered edition at no charge.

Also check the other states:

ARC - Numbered