This is an English flute with the initials VKS on it and although it looks complicated, it is really a simple eigth key flute. Each hole has its own key without interlocking mechanisms or such. VKS stands for 'Victor Kohlert and Sons', a well known maker from Graslitz.
Another example and more info can be found on Terry McGee's website: Ball, Beavon & Co - a Post Boehm Cylinder Flute