Some kind of hinge?

[DirtDigler]

These two brass items were uncovered on a skirmish line in Central VA. They are about 1/16" thick and apparently mount with one screw. I tried to fit them together, but they weren't a good fit. They look related, but maybe not. What do you think?

 

[DirtDigler]

Additional note: The edges are beveled and the hole is countersunk to accomodate a wood screw.