The claim that the book itself is signed is partially qualified by the book publisher within the same website that the book is sold.
PLEASE NOTE: PRESIDENT DONALD J. TRUMP WILL HAND SIGN BOOKPLATES FOR THESE BOOKS, HOWEVER WE ARE UNABLE TO PERSONALIZE OR ACCEPT
SPECIAL MESSAGING REQUESTS.
This adds an air of credence that the signature would be authentic. However, it makes no claims that the signature would not be autopen, and the heavy stroke of the signature in the image definitely lends some suggestion it would be either autopen or printed in a second pass process.
Note that the traditional location for an author signature is the Title page of the book. So a slip-cover signing is already a second rate signature.
Due to my understanding of the logistics of book selling, the only times when pre-sold books and authors collide occur fit into two categories:
- The author is self-publishing, so the vanity publisher is shipping the paid-for books to the author's home, who will act as distributor.
- The author is attending a "Book Signing" event where they are signing books as part of a publicity stunt in front of press or their fans.
Other means of "getting the book signed" are generally used when the book is being signed as part of the initial purchase from the publisher:
- The author signs a "sheet" which is inserted into the book.
- The author signs an "adhesive sheet" aka "sticker" which is attached to the book.
- The author signs a dust cover, which is then attached to the book.
- The author signs the book itself, at a book "gala"
This is why the dust covers are being signed, they are being shipped independent of the books, and then shipped back to the books. That's a good sign, that the signature might be closer to a traditional "book signing" signature; but the seller is very clear in their omission: the seller makes no claims of the means by which the signature is performed. I would imagine that a seller who wanted maximum impact would have the signature on the Title page, and having it one the dust cover makes it trivial to mass sign these, without the author and the book having been in the same room.
The images presented on the website do not favor a hand-signed advertisement (although they may be incorrect). Real ink pens tend to not be under the correct amount of pressure for the entire signature, and so they lack a "print quality" transfer on the strokes as seen in this signature. Note that the image in the circle is either using felt pen at an impressively even stroke pressure or is an image rendering of the signature in question.
That said, a signed book is usually not very valuable. They are usually worthless, unless the following is true:
- The book itself is a rare copy (doesn't apply here).
- The author never signed books (doesn't apply here).
- The author was initially obscure, and then was discovered later, and somehow you have their "early" signature which was rare for that book.
Notice that rarity is driving value here. There is no rarity in a signature you can literally just buy from the publisher. There have been a number of rare book that have seen a decrease in value as their signatures have proven to be forgeries.
A bookbuyer (/r/books reddit source, so beware) quoted
If it has a signed by the author sticker, 99% chance its worthless.
If its signed by a best selling modern author, 99% chance it's worthless.
If its a rare edition or a popular author who wasn't well sold when the book was released, then its probably worth something. As others have said, there are many variables into what makes it worth money.
Source: worked as a book buyer in the US's largest used book store for 5 years. Bought hundreds of rare signed copies for tens to hundreds of dollars. Passed on thousands of common signed copies.
Surprisingly, there are no pictures of the signed dust cover. Not even on collectable book sites, like https://premierecollectibles.com/. With that in mind, his "dustcover signed editions" of previous books featuring Trump typically demand $20 to $30 a copy. Not to fan partisan fires, but this pales in comparison to a limited run "special edition" print of a popular book (signed by a different president) at $1000 (discounted from $1250). So, I would argue that even signed in pen, in front of you, by Trump himself, on the book's Title page, it's not worth the price of the purchase, if he's likely to sign more than 1000 of them.