By John Turney
In 1976 and 1977 the Broncos went with a darker blue than in previous years. But the anomaly is not everyone got the memo. In those two years players could be seen sporting both shades.
Here are two players in the ligher model with everyone else in the new, darker shades
In the late 1980s they even seemed to get to be almost a baby blue, but at least everyone on the team had the same color:
Here are the helmets from the earlier 1970s:
Here are a few helmets purported to be game used from the relevant era.