This 4-7/8" steel pen has twin blades whose line thickness is adjusted by a screw. The pen is not marked. Similar ruling pens first appeared in Europe at the beginning of the 18th century.
References: Maya Hambly, Drawing Instruments, 1580–1980 (London: Sotheby's Publications, 1988), 57–58.
Sotheby & Company, Catalogue of a Collection of Scientific Instruments, the Property of the Late Henry Russel Wray, London, 1959 (a copy of the catalogue is in the accession file).
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