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A google search yielded results.
8420 is the custom series, around late 1980s if I remember correctly. The current equivalent should be 820GII. I have not played it, but by specs and design it should be lighter than the Xeno.
My tenor is an 820gii. Better than any Xeno tenor I tried, so I bought it. Very nice horn. Rings on a lot of partials. Easily worth $1200 I paid for it.