Very old antique W.J. Dyer & Bro. Diamond valve trombone.  Minimal dents but many signs of attempted repair.  The bell brace has been epoxied to the receiver.  The third valve finger button has been replaced (soldered on) with a 1913 penny.  All of the slides are frozen and most of the plating is gone from the pistons.  This is more of a conversation piece but you can blow air through it and the valves work sluggishly.  It has the feel of something that should belong in a museum.There is no case and no mouthpiece. No serial number.