Convex Mirror ‘Miroir à socle, 14x20, Noir gravé’

Auguste Wyten­hove was a French man­u­fac­tur­er of stere­o­scopes. His 1894–1895 cat­a­logue offered a broad range of stere­o­scopes and relat­ed view­ing devices. In 1897, the busi­ness was tak­en over by his son, Gustave.
In 1898, Wyten­hove’s com­pa­ny was acquired by Louis Legendre. Legendre’s busi­ness was sub­se­quent­ly acquired by Mat­tey in 1902. The ori­gins of Mattey’s stere­o­scope activ­i­ties can there­fore be traced back to Wyten­hove. Wyten­hove intro­duced the 8 & 9 trade­mark, which was lat­er con­tin­ued by Mattey.
(from: Com­pendi­um of Stereoscopes)