Upper Knife for Juki MO 6800 Series,6804,6814,6816 (201121A). Upper Knife for Juki MO 6800 Series,6804,6814,6816. Find all the parts you need for your machine at SewingMachinesPlus.com... - Upper Knife for Juki MO 6800 Series,6804,6814,6816 (201121A).