Well, I have a couple of them today-
In 1908 Colt's patented firearms manufacturing company came out with a rugged double-action six-shooter they called the "Army Special .38" that was built for the .38 S&W Special caliber. It was available in 4,5,& 6" barrels, and .32 and .38 caliber. It was the precursor to the modern Police Positive and Official Police, and the Mark III Trooper. It was never actually sold to the Army and was renamed "Official Police" in the 20's iirc.
That's almost as long as the Smith & Wesson Military & Police (also called a Model 10).
I'll take a Colt Army Special .38 and load it with the heavy police load .38-44 and I won't feel undergunned.