"German jeweller, goldsmith, silversmith. Hallmark: Keibel or OSK in an ovolo. Born in the town of Pasewalk in Prussia (1768). Worked on imperial commissions, including a liturgical set endowed by the future Empress Maria Fyodorovna to the Dormition Cathedral in the Moscow Kremlin (1788). Opened a workshop in St Petersburg, where he made goldware and silverware in the Sentimental and Neoclassical styles (1797–1809). ... Died in St Petersburg (1809), where his work was continued by his nephew and apprentice Johann Wilhelm Keibel (1809–62)." - http://www.rusartnet.com/biographies/russian-artists/18th-century/rossica/german/otto-samuel-keibel, 02.11.2019
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