This is the famous "Richard Wagner Organ" (reed organ) Built by Estey Co. in 1880.
Sometime ago I read that Wagner himself praised this instrument in one of his letters...
I am not sure if this instrument is the same one I saw advertised 2 years ago. If yes, the seller is starting to become more realistic about the price...when I saw it two years ago the seller was asking 3.500 Euros.
All the best,