Old books, like old money, need to be translated into today's values
Today there are numerous ways to know what the asking prices of books are and as Mike Stillman has correctly pointed out these are the prices of all the books that have not sold. What we show you are almost a million records of books, manuscripts and ephemera that have sold and we adjust the prices to current value. Now, for the first time, you can obtain a reasonably good idea of what your book is worth using a systematic process that identifies appropriate records, adjusts them to current value and averages them to provide you with a single valuation. Stray and inconsistent records are easily checked and eliminated if inappropriate.
Ultimately a seller may not agree to sell at the historically derived value but there is simply no reason not to know what the market history is. If you don't want to know it before you buy you will in any event learn all about it when you decide to sell. It's called reality. You may well have to pay more to buy material than these projected valuations suggest but you will also feel empowered to buy when the offers are well below what history suggests the real value is. Most booksellers want to sell their books. Some become argumentative if you discuss price but most will listen to an offer. If, in a reasonable amount of time, they believe they'll sell their book for their price they aren't going to discuss any concessions. If not, they will prefer to negotiate rather than lose the chance to sell their book to a knowledgeable buyer. This software helps both buyers and sellers to find the middle ground.
The development of this project has been undertaken by Mike Stillman, evaluated by Jenny McKinney who has already proposed a second version we'll begin work on this summer and implemented by Wei-cheng Chu, our software engineer. It is an important step in the evolution of bookselling on the net.
If you would like to sign up for a week or a month to give this software a work out click here and we'll take you to the sign-up page. A one week sign up is $7.95, a month $14.75, a year $141.60. For years the book business has been all about "asking prices." This is a step toward building the "bid side."
Gonnelli Auction 59 Antique prints, paintings and maps May 20th 2025
Gonnelli: Pietro Aquila, Psyche and Proserpina,1690. Starting price 140€
Gonnelli: Jacques Gamelin, Memento homo quia pulvis es et in pulverem reverteris, 1779. Starting price 300€
Gonnelli: Giorgio Ghisi, The final Judgement, 1680. Starting price 480€
Gonnelli Auction 59 Antique prints, paintings and maps May 20th 2025
Gonnelli Goya y Lucientes Francisco, Los Proverbios.1877. Starting price 1000 €
Gonnelli: Domenico Peruzzini, Long bearded old man, 1660. Starting price 2200€
Gonnelli: Enea Vico, Leda and the Swan,1542. Starting price 140€
Gonnelli Auction 59 Antique prints, paintings and maps May 20th 2025
Gonnelli: Andrea Del Sarto [school of], San Giovanni Battista, 1570. Starting price 25000€
Gonnelli: Carlo Maratta, Virgin Mary and Jesus, 1660. Starting Price 1200€
Gonnelli: Louis Brion de La Tour, Sphére de Copernic Sphere de Ptolemée / Le Systême de Ptolemée. Le Systême de Ticho-Brahe…, 1766. Starting price 180€
Gonnelli Auction 59 Antique prints, paintings and maps May 20th 2025
Gonnelli: Marc’Antonio Dal Re, Ville di Delizia o Siano Palaggi Camparecci nello Stato di Milano Divise in Sei Tomi Con espressevi le Piante…, Tomo Primo, 1726. Starting price 7000€
Gonnelli: Katsushika Hokusai, Bird on a branch, 1843. Starting price 100€
Dominic Winter, May 14: Taylor (John). All the Workes of John Taylor the Water-Poet..., 1630. £1,000-1,500
Dominic Winter, May 14: Pierpont Morgan Collection. Catalogue of the Morgan Collection of Chinese Porcelains, 1904 & 1906. £2,000-3,000
Swann, May 15: Lot 4: Helena Bochoráková-Dittrichová, Z Mého Detství Drevoryty, Prague: Obzina, 1929. First trade edition, signed by the artist. $4,000 to $6,000.
Swann, May 15: Lot 10: Nancy Cunard, Negro Anthology, with a tipped-in A.L.S. to Karl Marx's niece, 1934. First edition. $3,000 to $5,000.
Swann, May 15: Lot 14: Margaret Fuller, Woman in the Nineteenth Century, 1845. First edition. $4,000 to $6,000.
Swann, May 15: Lot 17: Lorraine Hansberry, A Raisin in the Sun, inscribed first edition, 1959. $2,000 to $3,000.
Swann, May 15: Lot 28: Margaret Hill Morris, Private Journal Kept during a Portion of the Revolutionary War, for the Amusement of a Sister, 1836. First edition. $3,000 to $4,000.
Swann, May 15: Lot 38: Anna Sewell, Black Beauty: The Autobiography of a Horse, 1877. First edition. $3,000 to $5,000.
Swann, May 15: Lot 43: Gertrude Stein, Portrait of Mabel Dodge at the Villa Curonia, signed presentation copy with photograph of Stein, 1912. First edition. $8,000 to $12,000.
Swann, May 15: Lot 48: Virginia Woolf, To the Lighthouse, first edition in the scarce dust jacket, 1927. $6,000 to $8,000.
Swann, May 15: Lot 54: Katherine Dunham, large archive of material from her attorney, 1951-53. $20,000 to $30,000.
Swann, May 15: Lot 55: Margaret Fuller Signed Autograph Letter, New York City, 1846. $3,000 to $5,000.
Swann, May 15: Lot 92: Sonia Delaunay, illus. & Tristan Tzara, Juste Present, deluxe edition with original gouache, 1961. $20,000 to $25,000.
Swann, May 15: Lot 93: Flor Garduño, The Sonnets of Shakespeare, 2006. Limited edition. $6,000 to $8,000.
Sotheby's Sell Your Fine Books & Manuscripts
Sotheby’s: The Shem Tov Bible, 1312 | A Masterpiece from the Golden Age of Spain. Sold: 6,960,000 USD
Sotheby’s: Ten Commandments Tablet, 300-800 CE | One of humanity's earliest and most enduring moral codes. Sold: 5,040,000 USD
Sotheby’s: William Blake | Songs of Innocence and of Experience. Sold: 4,320,000 USD
Sotheby’s: The Declaration of Independence | The Holt printing, the only copy in private hands. Sold: 3,360,000 USD
Sotheby's Sell Your Fine Books & Manuscripts
Sotheby’s: Thomas Taylor | The original cover art for Harry Potter and the Philosopher's Stone. Sold: 1,920,000 USD
Sotheby’s: Machiavelli | Il Principe, a previously unrecorded copy of the book where modern political thought began. Sold: 576,000 GBP
Sotheby’s: Leonardo da Vinci | Trattato della pittura, ca. 1639, a very fine pre-publication manuscript. Sold: 381,000 GBP
Sotheby’s: Henri Matisse | Jazz, Paris 1947, the complete portfolio. Sold: 312,000 EUR
![<b>Gonnelli:</b> Andrea Del Sarto [school of], San Giovanni Battista, 1570. Starting price 25000€](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/dc0b1dc0-f7c8-40b6-a5a6-870689484c07.jpg "<b>Gonnelli:</b> Andrea Del Sarto [school of], San Giovanni Battista, 1570. Starting price 25000€")
![<b>Dominic Winter, May 14:</b> Roberts (Henry, after). <i>Chart of the NW Coast of America and NE Coast of Asia ...,</i> [1784]. £500-800](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/033cf239-2b91-4588-aca2-50ad0a9c43b3.jpg "<b>Dominic Winter, May 14:</b> Roberts (Henry, after). <i>Chart of the NW Coast of America and NE Coast of Asia ...,</i> [1784]. £500-800")
![<b>Dominic Winter, May 14:</b> World. Ortelius (Abraham), <i>Typus Orbis Terrarum,</i> [1598]. £2,000-3,000](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/3ecbc3d4-52ef-41c5-8a8d-d4a158a51253.jpg "<b>Dominic Winter, May 14:</b> World. Ortelius (Abraham), <i>Typus Orbis Terrarum,</i> [1598]. £2,000-3,000")
![<b>Dominic Winter, May 14:</b> Bible [English]. [<i>The Holy Bible, Conteyning the Old Testament, and the New...,</i> 1613]. £2,000-3,000](https://ae-files.s3.amazonaws.com/AdvertisementPhotos/fcfb0b9a-4f59-4dc8-87fd-1dfdf90611dc.jpg "<b>Dominic Winter, May 14:</b> Bible [English]. [<i>The Holy Bible, Conteyning the Old Testament, and the New...,</i> 1613]. £2,000-3,000")
