You will have to call Colt.
A Colt police positive .38 and a Colt police positive special with that serial number were both made in 1913.
Your colt police positive was made by colt in 1930.
Your colt police positive was made by colt in 1935.
Your colt police positive was made in 1907.
Around 1920 for the Colt police positive special with that serial number
If we are talking about a colt police positive in 38 special,it was made by colt in 1915.
Impossible to answer without the serial number.
According to proofhouse.com a Colt police positive special with that serial number was made in 1957.
1921 for the Colt police positive special.
Your colt was made in 1912.
You will have to call Colt.
You must call Colt to find out.