X-Breath:
That's a nice Colt ya' got, but you should at least put a decent set of stocks on it...
Back when men were real men...
police or military service revolvers were expected to have long barrels, and they did. Plain clothes detectives sometimes carried long barrels too, but more often pocket revolvers, chambered in .32 S&W long or .38 S&W with 3 to 4 inch barrels. The advantage in long barrels (5 to 6 inches) was better balance, better ballistics, and longer sight radius. They didn't need adjustable sights because in those days each revolver was targeted in at the factory. There is absolutely nothing wrong with fixed sight where point of aim = point of impact.
Fortunately the "long toms" are usually discounted today in relation to similar revolvers with shorter barrels. DON'T ANYONE TELL THE GREAT UNWASHED GUN BUYERS OUT THERE ABOUT THIS, BECAUSE THE OLD FUFF SOMETIMES MAKES A KILLING!!! IGNORENCE IS BLISS - REMEMBER THAT...
Adjustable sights go back to at least the late 1880's so far as S&W and Colt are concerned, but they were always special order items. In the case of Colt, the rear sight could be adjusted sideways for windage, and the front for elevation. Fully adjustable rear sights showed up just after World War Two.
Just for grins, go down to your local VHS / DVD movie rental store, and see if you can find some made-in-the-1930's / black & white /crime thrillers. Then observe the handguns that are used. Great fun, and cheap entertainment.