Neat. Somewhere, I have a very similar item with the opera glasses made from bone or ivory, trimmed with gold-plated base metal. Mine has a view of Notre Dame cathedral through one side and the Eiffel tower (or maybe it was the Arc de Triomphe) through the other.
The one I have was produced as a souvenir charm and purchased just after the war by my parents during their honeymoon in Paris. It was 'newly-made' at the time, but I don't doubt that earlier pre-war examples exist back to the beginning of the 1900s. Difficult to date unless there are helpful marks.