Mother of pearl coming Paris opera glasses

Unfortunately they left lens is missing but I believe these were someone in my framilies. They are mother of pearl. They are very similar too these ones that date back to the 1890s. https://www.rubylane.com/item/451471-PA-00925/Antique-French-Opera-Glasses-Colmont-Paris . The only diffencencs are mine have the logo and name stamped into the the pearl eye piece and not the metal and also my pearl is more rainbow orange as theirs is more white. I'm just wondering when are my opera glasses from. I don't know if the place of stamping has a thing to determine date. They are about 3.5 cm wide by 9 cm long.