The Combat Government was not built in large numbers to my knowledge but I could be wrong on that. It was essentially a Government Model with then higher grade sights and a few custom enhancements that were common on custom builds and competition guns. It the later 1980s it was replaced by the Combat Elite which was essentially an identical pistol but was a blue slide over a stainless frame. The Combat Elite is a far more commonly seen pistol than the Combat Government.
One of my all time favorite shooters is my Combat Elite that Novak's worked their magic on for me. It's awesomely accurate and perfectly reliable.