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That was 1971.
made 1976
Diamondback serial # D69679. was mfg'd in 1975. made about 1976
made about 1977
Made in 1975.
made about 1972
From what I read, the Colt diamondback is made of steel and should be able to take plus P ammo. To be on the safe side, check with a gun dealer.
No such sn in the Diamondback series
I found a Colt diamondback with that serial number made in 1971.
You must call Colt to find out.
what is the manufacturing date fo a colt diamondback serial number O72239
You will need to call Colt to find out.