All kinds of musical instruments: brass, woodwind, accordions, percussion, electronic equipment, anything to do with making sound and other weird stuff.
This is a very rare item indeed, i wonder how many of these were made/still around.
It is 14 1/2″ long, 7/8″ wide, & is made of brass with nickel silver plating. It is stamped on the top section – LUDWIG & LUDWIG. CHICAGO, ILL. U.S.A. This would have been used for silent movies & theatre productions.