Without the serial number and a very good description to include caliber, bbl length, all markings and any accessories, the question can't be answered.
A letter from Colt will get you started.
Don't know value,but both Colt police positive special and police positive .38 were produced in 1910.
100-1000 USD or so depending on EXACTLY what you have.
Don't know the value but according to proofhouse.com, the Colt police positive .38 was made in 1926 & the Colt police positive special was made in 1919.
Don't know the value, but a Colt police positive special with that serial number was made about 1919.
It stands for the word "cartridge"
50-250 usd
200-300 USD. Maybe a little more if Colt did the reblue and you can prove it.
100-500 USD
about 1940
A Colt 38 police positive serial no. 357606 was made in 1932 and has some worth, but value is depending on overall condition
No. You did not provide the serial number.