Screiber Bb Cornet
Louis Schreiber, emigrated to the US from Germany in the
1850s, having already established himself an excellent cornet
soloist.  By 1861, Fiske was offering a Schreiber model 4 rotary
valve cornet and several New York firms offered copies of this.  
It was nothing like the cornets that Herr Schreiber was to design
in the 1860s, all of which have unique side action valve levers
and an additional rotary valve with reservoir to let out the water.
 Even more striking than these features was the shape of the
curved tubing.  In this case the main tubing forms a figure "8"
but he was even more famous for producing a unique family of
brass instruments with the bell over the shoulder as seen
here.  
His designs were patented between 1865 and 1867 and would
have been manufacturing instruments of all sizes from Eb cornet
to Eb tuba by that time.  His factory was short lived and seems
to have stopped operations by the early 1870s.  For more
information on Schreibers instruments including his patents,
click
here.

This cornet is 10 3/4" long with the shank removed with bell
diameter of 4 3/4".  The valve bore diameter is .459".  The Bb
shank is a replacement.