[maple_leaf_eh]

There are two thoughts to your problem. First is contact the fine art department at the local university. They probably have a sculptor who would know where brasses and bronzes are poured. One offs are not something a production shop will take on. Second is to ask at a sailboat marina. Small sailboats sometimes have fittings and devices that are cast. Most will come out of a catalogue, but there may be custom providers for the specialty builders.