This is a French Nonon flute currently listed on Ebay: http://www.ebay.com/itm/Nonon-Wooden-Flute-Paris-France-/300788227789?pt=LH_DefaultDomain_0&hash=item4608601ecd
What is the F## key (small covered key just above F#)? 
Prolly a helper key to sharpen F#, operated by RH3.
It just so happens that I played this flute a couple days ago (it was not for sale at the time), and I immediately went and took a photo of that squiggly key. How spectacular. The flute has an amazing sound, deep and dark and mysterious, and very strong for such small holes. I loved playing it. As much as I love block mounted flutes with many extra keys, on a flute like this they are actually smooth and functional!
Is that just wear on R1 and R2?
There are English Nicholson flutes that have something similar, I guess to help sliding from the hole to the keys.
The flute does look nice. I think it wouldnât sell for even a quarter of the asking price thoughâŚ
Are you sure itâs not a trill key?
mmmm, itâs my kind of thingâŚ
Certainly beautiful, interesting and desirable. Collectable, certainly, and maybe a fine player of its type. But I too seriously doubt it is worth the listing price, or even a fraction of that.
The keys are very oboe-like
Itâs worth some fraction of that!
But seriously, these are flutes that you read about in books and see pictures of, but rarely come up for sale, especially in this condition. I love older flutes with a silver embouchure too, because it seems more likely that the dimensions are unchanged, whether by man or nature.
I just realized that you can probably date this flute by the footjoint, which is influenced by the first âmodernâ version of this arrangement on the first generation of Boehm cylinder flutes. So even though Tulou and Nonon built flutes of this style earlier, this one is probably from the early 1850s, if I understand right. It doesnât look much later than that, but canât be earlier than 1847.