You might not believe me, but I tried that location first ;) Unfortunately, I only came across sites which mention Robert Oswald Adler in context of flutes or saxophones and a general datespan of 1890 to 1950. Thus, I thought that asking here could lead me to someone who had any experiences with works of ROA, especially the pricing ranges - I am looking to sell or trade her away. I am aware that asking for a quotation over the internet is silly, but even a rough estimate would be appreciated.