Oh - it's a 6 key block mounted simple system flute!
Sorry - you won't get much replies here - it's mostly Boehm heads around here (Boehm being a type of flute design) who don't appreciate the qualities of the romantic flute.
I had a simple system flute like this but the head was beyond repair. Mostly collectors are into the Potter, Astor, D'Almaine ones. After a hundred plus years, they don't have that magic 'grail' sound, but they do have wood worm; mould; cracks, hairlines, and elephant parts which are a big no no in today's CITES world. Plus the ivory tends to yellow as a dental product, since no one brushes their ivory end caps twice a day.
A modern simple system flute by a contemporary maker can cost from £600 - £3000+. The vintage ones (not for collectors) sell for about half the bottom end of that market maybe? I'm no expert, but I paid about £200 for unnamed simple system vintage flutes: the name on all the parts and no cracks/missing parts makes it reasonable to expect double for it (I think)!
If you're after the collectors market, you could try the antiques market or historical re-enactment groups. Maybe the usual auction houses, but they do charge commission for sales, and even shops in the city, will charge up to 20% if they sell your flute for you. Most simple system flute players keep the tradition of simple system flutes alive by supporting modern makers.
It looks like this flute has appeared for sale on ebay.co.uk with a different picture. Item #160836351623. I'm always wary of these 'urgent' sales. I feel they are just pushing buyers to put in bids without asking questions.
It's not an 'urgent' sale but I don't have the time for it to go to auction. With questions, there's not much help I can be a I know nothing about flutes other than the valuations the auction houses etc have given me.