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Details
An early 19th Century 9in. radius vernier octant
the ebony frame with inset ivory scale divided 2- 0- 107, clamp and fine screw adjustment and swivel magnifier to vernier, signed on the cross bar WM. DESILVA LIVERPOOL , seven shades, two mirrors, telescope and ebony handel, in fitted keystone case with period trade label for John Bliss & CO., 126 FRONT St. NEW YORK -- 13in. (33cm.) long
the ebony frame with inset ivory scale divided 2- 0- 107, clamp and fine screw adjustment and swivel magnifier to vernier, signed on the cross bar W