Foldable Stereoscope ‘Stéréoscope pliant en acajou’

The Stéréo­scope pli­ant de poche is a well-made fold­ing stere­o­scope with lens focus­ing and inter-ocu­lar adjust­ment. The view­er was also avail­able in a lux­u­ry ver­sion, sup­plied in a rich moroc­co leather case with clasp.
(from: Com­pendi­um of Stereoscopes)