The article focuses on the new copy of the memoir work by famous Athos monk Seleucus (Stephan Trofimov) founded at the Titov collection of manuscripts which is preserved at the Manuscript Department of the National Library of Russia. The article includes the results of paleographical, codicological and handwriting studies of Titovsky copy. It shows that this copy was a proofreading of the manuscript, which was lost. The proofreading was made not later than 1878. A selective comparison of the text of the Titovsky copy with the Athos and Troizky copies allowed the author to propose a hypothesis that Titovsky copy includes the different redaction of the text. In conclusion the author insists on a word-for-word comparison of the text of the all three copies, because the future results can change the traditional conception of the history of the work by Seleucus.