Loose paper in large sheet format, printed on one side only, without any superscription, but with the following date at the bottom: In Venetia, after Nicolo Bevilacqua, 1561. On 25 October. In essence it is a manifesto, where all the particularities of the Arciorgan built by D. Nicola are described in detail, he offers to give it to anyone who wishes to purchase it, and to teach how to play it. This print of the greatest rarity is perhaps the only original copy that exists today; and it was therefore a good idea to publish it in the columns of the Gazzetta musica di Milano.

http://www.bibliotecamusica.it/cmbm/scripts/gaspari/scheda.asp?id=1534