This is a Continental model AB of the sort that Bausch & Lomb introduced in the 1890s. It is a compound monocular with micrometer screw for fine focus, square stage, and sub-stage mirror. The inscription on the black horseshoe base reads “BAUSCH & LOMB OPTICAL Co. / ROCHESTER, N.Y. NEW YORK CITY.” The objective is missing. The 37718 serial number indicates a date of 1902.
Ref: Bausch & Lomb, Microscopes and Accessories (Rochester, N.Y., 1900), pp. 26-27.
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