I recently rebuilt a gold-plated Buescher True-Tone tenor (circa 1927) and in the process quickly found that the body and most of the keys had a coat of clear lacquer.
I'm assuming this was something that one of the horn's owners had a a repair shop do later in life. But I thought I might ask the Buescher experts here. Did the horn makers put protective lacquer coats on their plated horns?
Not a Buescher, but I also have a silver Martin Comm II that served in the military. It too had a heavy coat of clear lacquer that had yellowed. I chemically stripped that away but wondered if it was something the military bands routinely did to their plated horns.