According to profhouse.com, it was produced in 1977
what is the manufacturing date fo a colt diamondback serial number O72239
No such sn in the Diamondback series
Go to : www.proofhouse.com
Diamondback serial # D69679. was mfg'd in 1975. made about 1976
You will have to call Colt. Published sn data does not show any Diamondback with a sn starting with a P
I found a Colt diamondback with that serial number made in 1971.
1977
On the butt
Post 78
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
made about 1977
made about 1972