Please allow dfariswheel to show up and enlighten you on Colt's history and frame sizes, as the Officers is smaller than the New Service as I recall. I'm not sure about time frame but that will factor in as well. Check link out below...
A free people ought not only to be armed and disciplined, but they should have sufficient arms and ammunition to maintain a status of independence from any who might attempt to abuse them, which would include their own government." - George Washington, January 8, 1790, First State of the Union Address