From 1727 to 1784 no special mark was used at Alcora. In several instances specimens were signed with the painter's name or initials.
In order to distinguish the qualities or sizes, coloured numbers were frequently added.
From 1784 the letter A in gold or colours was used to mark the pottery and porcelain made at Alcora.
The following marks were used after 1784. The a underlined, A, sometimes in blue.
A number and letter, No. 4 A, G 8; No. 3 P. In 1799 the pottery made by Friar Joseph de Zaragoza was marked M. O. X.
