You must call Colt to find out.
No such sn in the Diamondback series
what is the manufacturing date fo a colt diamondback serial number O72239
Nothing. Have it checked by a gunsmith to be sure.
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
That was 1971.
Go to : www.proofhouse.com
1966-1986
Try your local gunsmith or write or call the Colt mfg company.
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
1972