I can find no serial number in the Police Positive range similar to yours.
Your colt official police was produced in 1951.
Don't know value,but Colt official police sn 913044 was produced in 1966.
5-200
100-1000 USD
5-500 usd
Colt official police .38 serial # 905140 was produced in 1966.The year 1966 started with serial # 905100. Sorry,do not know the value.
value depends on overall condition....................
$275 to300
50-400 usd
50-400usd
50-500 usd
value depends on overall condition.................