Stuller could cast it up for you. Anything marked "metal mold" in the
catalog can be special ordered in other metals. They have a series
called scroll settings and I'm not sure if that would have the
antique look you are after. It's the only thing that comes to mind.
Another place to check would be New York Findings. They have a lot
of unusual findings. The catalog is laid out poorly and things are a
little hard to find. Perhaps they have something that would work.
Wait a minute. ALA Casting might have something. Some of their older
hard covered catalogs could have just the period specific head you
James S. Cantrell CMBJ