The Seal of the Deacon is an ink seal that takes the place of the Seal of the Fisherman for Apostolic Briefs and various other documents from the Roman-Ruthenian Pope. It consists of an image of St. Stephen the Apostle, Archdeacon, and Protomartyr holding the key and sword from the Roman-Ruthenian papal insignia. Around that is the name of the pontiff in Cyrillic followed by dynastic numeral and "Pope-Catholic of Roman-Ruthenia" in Cyrillic.
Example of the Seal of the Deacon.