Try here: http://en.wikipedia.org/wiki/Colt_Police_Positive_Special
if it's a revolver......32 cal revolver ammo if it's a pistol......32 cal pistol ammo
5-200
It stands for the word "cartridge"
50-250 usd
Official Police ser numbers started at 513216 in 1927. I believe you have a Police Positive Special from 1921. It was chambered in .32 Colt, .32 New Police, .38 New Police and .38 S&W, .32-20 and .38 Special.
Made in 1951
made about 1963
If your pistol is a new police model 32 cal, your serial number dates to 1906. The value really depends on the condition. Take it to a gunsmith or appraiser or go to auctionarms.com to get an idea of what they are selling for.
No way to answer without the serial number.
$500.00 to $900.00
50-500 usd
Contact Colt