That is an interesting-looking Flattop revolver. Do you have a Colt letter? From the grips, it apparently dates 1924 or later. Has the barrel been cut, or the front target sight removed? The 32 Police Cartridge was also known as the 32 S&W Long, introduced in the mid-1890's and promoted by none other than Theodore Roosevelt. Theodore Roosevelt was the head of the New York City Police 1895-96.