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This thing is called a Sextet. What you’re looking at is only part of it. It looks like a paddle wheel from a river boat. It has SIX harmonicas mounted on it. There are little handles on the end of the frame that holds it all together, and you can spin it around to use the different harmonicas as you’re playing a song. They are used for old pop standards from the 20s and 30s and 40s. This sort of thing used to be much more popular than it is now. It’s impressive to see someone really work one of these things over.