This is Jimmy Page doing "The Battle of Evermore" during his MTV Unplugged tour with Robert Plant in 1994. It produced the album/DVD No Quarter, which is pretty excellent -- filled with interpretations of old LZ material with a Middle Eastern flavor.
Looks like a triple-neck with mando, 12 string guitar, and 6 string guitar. (He was known for his 12 string / 6 string doublenecks, but this is the first time I've seen one with a third neck.)
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