Butterfly Hinge
Butterfly hinges, are also known as dovetail hinges. They are frequently used on corner cupboards, kitchen cabinets, bible boxes, etc.... Constructed of wrought iron, the hinge shown measures  2" x 2".  Screws included. Two more sizes available, see below.

$52.95 per pair
s&h: 6%, but at least $6.95

1.5" x 2" priced at $52.95
2.5" x 3" priced at $57.95