Try your local gunsmith or call/write Colt Mfg. Co.
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.
100-1000 usd
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
What is the value of 1903 colt pocket pistol.32 calibre?
You will have to call Colt.
Go to proofhouse.com and click on diamondback.
50-250 usd
50-600 usd
50-175 USD