Around 1968.
1969 value guesstimate around $450
made about 1977
are you sure the '0' is not a 'D' ????? in the serial number
Without serial number, between 1966 & 1988.
Post 78
Check the the number again since no Diamondback had a serial number starting with the letter S. Possibly after 1978. My list shows 1978 starting with R13901 that being so, Swould come after R
what is the manufacturing date fo a colt diamondback serial number O72239
You will have to call Colt. Published sn data does not show any Diamondback with a sn starting with a P
Diamondback serial # D69679. was mfg'd in 1975. made about 1976
Proofhouse.com has Colt sn tables. You can also call Colt and they will tell you.
Proofhouse.com
1977