Viewer, with lens set in body tube having inner glass tube and two plane discs holding ants eggs 1831-1870
Viewer, in two parts, each with a cylinder carrying an eyepiece with an advertisement, French, late 19th century Viewer, in two parts 1865-1875
Simple viewer, in case, English, mid 19th century Simple viewer, in case, English, mid 19th century 1830-1870