Kdog CZ -
Likely approach would be to remove all paint (I'd use MEK in a ziplock bag for 20 minutes or so to start - and use rags to pull off old paint and not remove any phosphate if it is there) - then just repaint to match the factory job - even with normal semi gloss black spray enamal paint it would work, or you could go with a higher preformance gun "kote" product. If it was phosphated first at the factory, it will be easy to tell and a repaint will stick quite well. If it was shiny bare metal, you can go a number of other directions with it - rust blue might look very nice with some fancy new grips....
That's all steel, right? Frame and slide?