Use small dents near the mouthpiece larger dents around the bell mouthpiece does not come out Check all the pictures let me know if you have questions
Vintage Rexcraft US Regulation Bugle Brass Pair 16.25" Military Signaling Horn
Rexcraft US Regulation Bugle Boy Scout Solid Brass
US Regulation Brass Bugle Approx 17” For Decoration Or Parts - Very Cool Brass
Rexcraft U.S. Regulation Bugle + 15" Brass Bugle Pair – Restoration/Display Lot
Vintage Rexcraft Brass U.S. Regulation Bugle Signaling or Ceremony 17" w/Case
Vintage U.S. SIlvertone Regulation Military Brass Bugle With Mouth Piece