Here are pictures of the most beautiful flutes I own.

 Anonymus flute, 6/8 keys, boxwood with ivory rings, 3 middlejoints 430 Hz, 435 Hz, 438 Hz, D-foot, C-foot, in the original box ca. 1815

A photo of the same flute in the box, unfortunately the writing on the lid is not completely readable.

A beauty is the 8 keyed flute 438 Hz by Johann Gottlieb Streitwolf, ca. 1830, later Streitwolf built flutes with a nearly rectangle mouthhole. Some intruments of him are kept in different museums, like Oxford Bates Collection, Germanisches Museum... Streitwolf was a well known and very good instrument maker, he built flutes as well as clarinets and oboes.