Repairing a bronze item

I realize this is probably way below the level you folks are used to working at, but I'd appreciate any advice any of you can offer me.

I recently bought a walking stick with what appears to be a bronze head. There is a mark that I had thought was a stain to be cleaned off, but on closer examination, it seems to be a chip on the outer layer.

I'm unsure if this is bronze plated onto a more sturdy (or more cheap) metal, or if it's just unpolished, or what, but I would like to clean it up a bit. Ideally, i would like it the same color as the rest of the piece, but I'll take whatever advice you folks can offer.

Thanks for any suggestions.