Soss Invisible Hinges - Cabinet And Furniture Hinges - Amazon.com
SOSS 101 6-in H Satin Chrome Mortise Concealed Interior Door Hinge (2-Pack) in the Door Hinges department at Lowes.com
HLMOptimo 6inch Hidden Door Hinges Invisible Hinges Concealed Hinges Zinc Alloy 180 Degree Swing Hinge 3 Way Adjustable Butt Hinge 6 x 2.5 x 1 inch (Silver Pack of 2) - Amazon.com