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Handwritten numeral, likely a shelf mark or folio number.
A 1858
Likely an acquisition date or catalog number added by a later collector.
JEWS' COLLEGE LONDON. Stamp of the library of Jews' College, London, a rabbinical seminary founded in 1855.Original Hebrew: Sefer Ma'ayan ha-Chokhmah. This is a foundational text of Jewish mysticism (Kabbalah), traditionally attributed to Moses or the angel Metatron.
Amsterdam was a major center for Hebrew printing and Jewish intellectual life in the 17th and 18th centuries.