This flute was made by Theobald Boehm in Munich, Germany in 1848. It is a Boehm System flute, serial #4, made of silver with a wood lip plate and accessioned with a period case. This flute is engraved:Th.
Theobald Boehm Flute National Museum of American History
Theobald Böhm's comment on the open G sharp key
Woodwind 19th century hi-res stock photography and images - Alamy
Theobald Boehm, German, Transverse Flute, German
Open G Sharp Key
Recital: Anne Chao '23, Flute
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A Brief History Of The Flute
Recital: Anne Chao '23, Flute
Boehm system (clarinet) - Wikipedia
Theobald Böhm's comment on the open G sharp key