Just checked Kanstul's old website (which is fortunately still running as an archive, at least for now) in case I misremembered.
http://www.kanstul.com/instruments/e...ing-euphonium/
It looks like they did offer both bronze and copper bell options on the 976, though it doesn't say if they used a sheet of copper, or something like the electroplating method that Conn used to use for their "Coprion" bells. Either way, it's a neat offering and kind of cool how the bell was removeable.
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