I found this in sarasota at a park near the water. Looks old and ornate. Possibly silver by the way it is on the back...looks spanish...from a bracelet?
Also is there a makers mark on it its value can be more if you know some history on it I think its a great piece of history!!! sometimes its fun not knowing!!!!!!
It could also be the clip from a pocket watch chain. The end that would clip to your breast pocket, while that post is where the chain would swivel. not sure but may be another lead if your stuck.
I was doing an image search and came across the J. Flores pieces from Taxco Mexico. It's not a straight up match; but there's good similarity in hinge style. My first guess was a necklace pendant but with the cross having a hinge hole on the bottom a bracelet still seems like the best bet. The male clasp end looks similar as well.