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In Comparative Diagram 1, we can see that many imprints are identical including Jubert's fer à l'oiseau (jj-4). In Comparative Diagram 2, I have reproduced 4 different Jubert examples of the fer à l'oiseau, below these we see the Jubert jj-4 imprint compared with Derome and Dubuisson examples. The fer à l'oiseau is probably the single most diagnostically important tool of the 18th century, yet it seems the least studied, nowhere will you find a detailed diagram of all the important specimens, classified by the workshops from which they derive. Mainly due I suspect to the fact that most the known examples have been attributed in the past, to Derome. Nearly every binding where these imprints are present has been systematically attributed to the workshop of Derome. We have now been able to separate the Derome and Dubuisson examples, and similarly we can separate these from the Jubert examples. I must point out again that the Derome imprint of this type (dj-4) has yet to be encountered in any binding decorated by Jubert. In the Planche XXXiX example shown above, we see two different forms. however Dacier mentions only 'the' fer à l'oiseau as being a particular personalized tool of Derome, and notes that the same identical tool is found on two other bindings that were in the Exposition of 1929 ( Les plus belles reliures de la réunion des Bibliothèques Nationales. numbers 360 and 361), but these did not contain Derome's signature tickets. (see this reference reproduced below from the 1929 Catalogue.
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