Marcasite Trembler Brooch

Vintage art nouveau trembler brooch. Marcasite in a silver tone setting creates a fabulous flower design. Very 3 dimensional; petals of flower can spin (tremble). So hard to describe well, please check photos. One of the leaves is damaged (pics), but it doesn’t seem to affect the integrity of the brooch, and some finish is worn on back also. Cannot make out the hallmark, sorry. And the pin itself has a sort of handle on it, I’ve never seen anything like it before. This is very unique and beautiful despite minor flaws.