This Rudall, though misnumbered, is up for auction Aug 13. Seems to be in very good shape and likely will play quite nicely.
It’s a Rudall, Rose, Carte & Co. They say #5175, but that cannot be accurate based on the name of the firm and likely address (20 Charring Cross). My educated guess is 6175, which would fit, based on my catalogue research and data of Rudall flutes.