At one point in my life I decided instead of just normal engraved stationery, I wanted a watermark. So I went to Mrs John L. Strong, and sat down with Mrs Lewis. Mrs John L. Strong has its own watermark, so surely they would know a paper mill that could accommodate my plan, I suggested. Mrs Lewis explained very tactfully, in as positive and genteel a way as possible, that no. Mrs Strong would certainly be able to help design a beautiful paper that evoked the subtlety of a watermark. I was glad to hear it, that we would be able to produce a paper with a watermark.
She said, “What part of ‘no’ did you not understand?” only it was the Vanderbilts’ stationer on Madison, so it came out like, “It’s interesting when two people have a conversation about the same thing, how they understand it differently.”

The point is, yesterday I read that in 1996, not so far from the time I was pursuing my watermark, Yvon Lambert published On Kawara’s CODES in an edition of 150 “on 180gr/m2 pure rag paper made especially for the book by the Moulin de Fleurac* and watermarked by Cy Twombly.” And I realized I’d been doing it wrong. But to know how wrong, I needed to figure out wtf is going on with why Cy Twombly is making and watermark paper for On Kawara.
He did not, and it was not. The listing for CODES in the Bibliothèques de Paris clarifies: “Chaque feuille porte la signature d’Yvon Lambert en filigrane (réalisé par Cy Twombly)” So the watermark is Lambert’s, as written by Twombly.
And Twombly also made his bookplate. So far I can find images of neither. But we do have two versions, four years apart, of Twombly’s ex libris for Dr. Reiner Speck, courtesy of Dr. Speck’s show of Twomblyphemera at Maison d’Art.

Do I need to check the prints CR to get a full bookplate inventory? Is a watermark a print, a drawing, or a sculpture?
*Lambert’s choice of mill for his small batch watermark paper is instructive. He did not ask Arches. Though Moulin de Fleurac sounds prized, specific, and ancient, it only started in the 1970s.