On the mother-of-pearl circle inscription "Maison Crosti Bordeaux, L. Larghi successors optician engineer", slightly erased. Bee hallmark.
Napoleon III period, late 19th century.
Dimensions: unfolded: H 7.5 cm, folded: 5.5 cm, length 9 and 10 cm, diameter: 3.7 and 2.7 cm
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