Proofhouse.com has Colt sn data. 100-1000 USD
Colt official police .38 serial # 905140 was produced in 1966.The year 1966 started with serial # 905100. Sorry,do not know the value.
Don't know value,but Colt official police sn 913044 was produced in 1966.
Your colt official police was produced in 1951.
$275 to300
50-400 usd
50-400usd
50-500 usd
value depends on overall condition.................
Made in 1964.
100-500 USD
50-250 USd
made about 1969. value depends on overall condition