Try your local gunsmith or call/write Colt Mfg. Co.
100-1000 USD
Try your local gunsmith or write or call the Colt mfg company.
colt diamond back is was made in 22lr & 38 special.with a ventilated rilb barrel. the colt trooper was chambered in 357mag. without a vent rib barrel.
No such sn in the Diamondback series
You must call Colt to find out.
what is the manufacturing date fo a colt diamondback serial number O72239
You will have to call Colt.
Go to proofhouse.com and click on diamondback.
You will have to call Colt. Published sn data does not show any Diamondback with a sn starting with a P
1966-1986
Go to : www.proofhouse.com
That was 1971.