File:C. F. Martin Renaissance style guitar (between 1843-1852) detail - Early American Guitars：The Instruments of C. F. Martin - MET (2014-08-08 10.30.57 by edwardhblake).jpg - Wikimedia Commons
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File:Stauffer style guitar (1834) Christian Frederick Martin, Sr. - Early American Guitars：The Instruments of C. F. Martin - MET (2014-08-08 10.16.16 by edwardhblake).jpg - Wikimedia Commons
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