A lovely piece! :D I already follow the musician on Youtube, he's really good! And, yes, that's a 5/21 chord zither he has there. He's using a non-standard tuning, though - probably to make the instrument suitable for somewhat-contemporary American music.
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Here this style of zither is sometimes known as an autoharp.
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Zithers were quite popular in our area at the end of the XIX century.