Did I mention that you can 3D print brass?
Actually, you have waxes printed for lost wax (investment) casting. Not cheap, but sometimes you have a special part that just needs that little extra bit of love!
The pictures below show a pair of small deck mounted fire monitors from the 1940's, and some cabin-mounted vents. The parts were ordered from Shapeways in "raw brass", which means they don't polish them much, other than a quick tumble deburr. You can also order parts fully polished, even gold plated (!), but these parts are smooth enough to hand polish easily.
The fire monitors are left as bare brass- I assume the original was bare brass and bronze... but the vents were chromed, which I've simulated with simple nickel brush plating at home.
Detail is pretty darn fine... the plaster pattern will catch the finest details in the wax... look for the bolt heads on the fire monitor's flanges, and the crenellations on the lock knob...