Very difficult to get hold of, Muramatsu DN (earlier DS), with C# trill key, often preferred by professionals. Newly overhauled.
Muramatsu DN flute
Click on the second photo to watch a video of this flute.
Very similar to current DS model, slightly more deep, mellow sound, whereas the current DS/GX models cut through with a more orchestral sound. £8000 current new price.