We have 4 hinges in an arrow design Vintage Items.  I believe these are faux hinges for decoration only.  They have been painted tan on one side with some overlap of the paint on the black back.  The finish is a pebble finish on the metal.   These measure about  14" in L 1 1/2" across the flat end and about 1 3/4" across the arrow. 

4 Metal Hinges Metal Arrow Vintage