Optometer, engraved "Optometre de Maurice Perrin and Mascart
Optometer, engraved "Optometre de Maurice Perrin and Mascart, S.Maw Son and Thompson, London, E.C., in box 10 3/8"x5 7/8"x3", no key, c.1880.
Optometer, engraved "Optometre de Maurice Perrin and Mascart, S.Maw Son and Thompson, London, E.C., in box 10 3/8"x5 7/8"x3", no key, c.1880.