The intelligence is devoted to the introduction into the international scientific circle of a unique source on the history of the zemsky liberal movement in the north of the Left Bank of Ukraine -prints from the archive of M.Shlippenbach. The history of finding the scientific artifact and the circumstances of its transfer to the private museum collection of N.A.Kotelnitsky is highlighted. A scientific description and measurement of an important historical source has been carried out.The laconic historical certificate about the historical figure of MI Petrunkevich-owner of the seal is provided. On the basis of the content analysis of the epistolary by M.A.Shlipenbach from the private archive of N.A.Kotelnitsky, the hypothesis of Nikolai Andreevich is declared that the imprint on the imprint of the seal may be a prototype of the family coat of arms of the dynasty Petrunkevich. Due to the fact that till now the Petrunkevich family coat of arms has not been found, the author states that the image on the imprint of the stamp is a personalized personality mark of M.I. Petrunkevich. In the context of this, brief background information is provided on the existence of such personal personalized characters in the aristocracy of the Russian Empire, which did not have officially approved coats of arms.The emphasis is placed on the importance of the historical source for studying the problems of the aristocratic genealogy and the heraldry of the main representatives of the opposition movement. In general, agreeing with the hypothesis of M.A.Shlypenbach, N.A.Kotelnitsky initiates a problem of finding, forming and studying the heraldic gallery of the leading representatives of the zemsky liberal movement northern Ukraine