Briquet's own earliest-dated watermark entry (no. 5410) carries a question mark on '1282' and is sourced to Bologna, not confirmed as Fabriano
The specific year "1282" commonly attached to the watermark's origin most plausibly traces to a single catalog entry: Briquet no. 5410, a Greek cross, the earliest-dated watermark in the entire Les Filigranes repertory. Modern archival reconstruction of Briquet's working method — Neil Harris and Ilaria Pastrolin's "Briquet Reloaded" (2018), a project returning to Briquet's original documents and unpublished tracings — reports that this entry is sourced to the Bologna archive, where most of Briquet's references carry only the generic notation "Podestà" with no further pressmark, and that it has "proved impossible (up to now)" to locate the original document behind it.
Two problems compound. First, Briquet's own marginal annotation for the date carried a question mark — he was not certain of the reading when he catalogued it. Second, the entry is attributed to Bologna, not Fabriano; the popular formulation "watermarks originated in Fabriano in 1282" cannot, on this account, be traced to a confirmed Fabriano document at all. See claim-watermarks-originated-as-papermakers-mark-in-fabriano-1282 for the claim this bears on, and claim-briquet-1907-catalog-title-hedges-fabriano-date-as-vers-1282 for Briquet's companion title-page hedge.
Source
“his references are chronological: such is the case for possibly the most important archive of all, Bologna, where in most of his entries the only indication is 'Podestà' and where it has proved impossible (up to now) to find the original of the earliest watermark in the repertory, Briquet 5410, a Greek cross dated '1282', albeit with a question mark.”
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