Welcome to the TNet, and thanks for showing your spoon like object. It makes me wonder where, and in what context you found it.
I believe it's half a spoon mould. I'd be interested in seeing better photos, if you're so inclined.
"The brass spoon mold containing a pewter spoon made in the mold is the only piece not discovered during a local dig. The man who donated it said it had been in his family since the late 1700s." 450 years of unbroken history | StAugustine.com