And of those 3000, a lot were removed when the gun came back to Colt for about any repair, kind of like the present Ruger transfer bar conversion.
As I understand it, the 1900 with sight safety had a full length firing pin, so there was no condition 2; hammer down on a loaded chamber. Either depend on the sight safety, half cock, or condition 3, chamber empty. This last was recommended in a period magazine article about the new guns.
The 1902-1903 guns had inertial firing pins so if you felt froggy enough to manually decock, they were safe in condition 2.
What I do not know is whether they put in an inertial firing pin when they took off the sight safety. Not a tactical problem these days, the old guns are seldom shot.