"Le Nain" is a curious stereo viewer manufactured by A. Mattey from Paris. It is a cross between a handheld and multiview stereoscope and supports 45 x 107mm glass stereoviews.
Stéréoscopes A. Mattey was one of the largest manufacturers of stereoscopes. Little is known about the company. A catalog, invoice and cheque reveal something about its history.
A Métascope multi-view table stereoscope for viewing 45x107mm glass stereoviews by Unis France, one of the trademarks of Mattey from Paris.