or the negotiating margin that a bookshop’s source code hands to its customers
Dear bibliophiles, good day.
By Olympe Marcelet, inspector of platforms, of emphatic keywords and of prices one would rather not display.
My colleague Raturon published yesterday the fine story of the Saint-Brieuc manuscript and its 3 successive prices. The first 2 appear in the sale record: estimated at €200 to €300, lot 77 was knocked down at €85,000, or €103,360 with the 21.6% buyer’s fees. He left me the 3rd, which can be found nowhere. Or almost…
The manuscript’s listing at the dealer’s is a model of its kind: complete, precise, learned, with the dating, the scriptorium, the collation, the pastedowns, 2 named and dated expert opinions, the provenance traced back. Where the price should appear, a single word: Inquire.
The custom is old and respectable. Beyond a certain amount, the price is not displayed, it is spoken. The buyer of a 9th-century codex is not a passing customer, and a dealer has the right to know whom he is talking to before talking money.
I have nothing to say against this convention, which still distinguishes an antiquarian bookshop from an ordinary sales site. After all, we are not on Catawiki or eBay…
It rests, however, on an assumption that is no longer true in a digital world: that the price is to be found only where the seller put it.
The pages of this site, like those of nearly all online trade, emit a series of tags invisible on screen… which for me are so many invitations to put on my spectacles.
They have telling names (the amount, the currency, the formatted label meant for social networks) and they exist to be read by machines: the preview that unfolds when a link is pasted into a messaging app, the comparison engines that harvest catalogues, the indexing robots. The shop generates them automatically from the “price” field of its own database. Hiding the display on screen does not empty that field; it remains readable at the tag level.
They can be read in 3 seconds, with no particular skill, by displaying the page’s source code. On the manuscript’s listing, as I write, they carry an amount: €850,000.
Another listing from the same shop confirms the mechanism: the autograph letter from Kafka to Robert Klopstock shows €45,000 on screen, and its tag carries the same amount, in the same field. In both cases the price is entered and transmitted. Only its display changes.
Now, as Alcide Raturon pointed out, an online publication by the Boston fair, whose 48th edition opens on 6 November, shows a different amount for this same manuscript: $1.4 million, or about €1.2 million.
2 figures in writing, then. One quietly announced to the public 2 months before the fair. The other entered in the listing, invisible on screen, readable by anyone who opens the source code. Some €350,000 separate them.
I have no idea what the lower figure represents, and I will refrain from deciding. A price asked earlier, which the update did not reach. A floor the dealer set for himself and entered in his system. The threshold below which he will not go. Each of these hypotheses is plausible, and I have no way of choosing between them.
The practical effect is the same in all 3 cases.
A collector who turns up at the stand in November, having spent 3 seconds in the source code, will not open the conversation at 1.4 million. He knows that a lower figure exists, written by the seller himself, and he knows by how much. The convention of price on request existed so that the dealer would choose the moment, the interlocutor and the amount he names. The technical layer of his own shop has transferred that advantage to whoever thinks of looking. And that potentially makes for a handsome saving.
I specify, to cut short any quibble, that none of this contravenes the customs of the trade. The customs code of the International League of Antiquarian Booksellers has an article on price clarity, but it concerns material offered in open shops and at fairs, not websites. Price on request online is beyond reproach. The consequence is this: at Boston, in November, this manuscript should carry a clearly indicated price. The figure will thus become public in 2 months, on a label, in front of everyone. The discretion at issue here will have lasted only as long as the online catalogue.
I have verified the mechanism on only 1 shop and 2 listings, one with the price displayed and the other without, and I have not inspected colleagues who follow the same custom. I would be surprised if Vienna were the only one concerned: this is the behavior of an online shop, not a Viennese invention, and those who recognize themselves will go and look at their own source code before smiling at this one.
Dear bibliophiles, dear booksellers, to your tags.
Editor’s note. Dealer’s listing: display “Inquire,” product tags carrying €850,000, last modification stated as 27 July 2026, 5 days after the second of the 2 expert opinions cited in the entry. Readings taken on 31 August 2026; the values may have changed since.
GUILDE · OM/BALISES
Document classified: restricted circulation.
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