There is a twist of heavy brass on the mouthpiece to attach a chain or similar.
Vintage Brass and Copper Military Bugle with Mouthpiece, Cord and Tassels
Vintage Brass And Copper Bugle, Military Or Boy Scout, Musical Instrument, Used
Vintage Brass and Copper Bugle
BUGLE, VINTAGE BRASS AND COPPER, GREAT PATINA, MARKED iNDIA