Proofhouse.com has Colt sn data.
Good revolver.
For the Colt positive special ,it was in 1934.
That Colt police positive special with serial # 594826was manufactured in 1951.
about 1919
police positive special made about 1920
It was manufactured in 1920.
Army special & officers model officers model special single action army & bisley revolvers police positive .38 bankers special police positive special & detective special
38 special is only a revolver caliber. that's like saying a 44 magnum revolver or a 500 special revolver. a revolver is a revolver
1962
You will have to call S&W to find out.
made about 1963....................
made about 1930