Imperial diploma of hereditary nobility, awarded to the Zimmerman family and its descendants by Tsarina Catherine II, through the granting of the coat of arms and seal.
Parchment document composed of 5 sheets for a total of 10 pages, 420 x 295 mm. The text is framed in a phytomorphic frame, intersected by cameos: the one in the top center bears the tsarina's initials, EA (Ekaterina Alekseevna), all the others, however, images of battles (probably referring to the battles in which the Zimmerman brothers, who served in the Russian army under Catherine II), on the first card stands the portrait of Catherine within an oval overlooking Saint George and the dragon, all above the black double-headed eagle symbol of Russia, on the recto of the fourth sheet the heraldic coat of arms granted to the Zimmerman family, signed on the last sheet by Catherine II (Ekaterina) and signed by the vice chancellor; it also contains the description of the coat of arms: a shield carved into six parts, three golden and three blue, crowned by a helmet with a leopard's head on top from which three ostrich feathers emerge. Green silk sheets to protect every single page, binding covered with silk threads, very damaged, large wax seal 120 mm in diameter perfectly preserved in a metal case. All collected in a fine green leather box.