0-1000 usd
You will have to call Colt
Fine pistol
Depends on overall condition and if the nickel is factory or after market. Range from 0-500 USD.
Proofhouse.com has Colt sn data.
the ACP in any gun cartridge means Colt Auto Pistol
Ruger is the name of the company that made the pistol. .380 ACP is the cartridge size. ACP stands for Automatic Colt Pistol- part of the cartridge name, as some of the first of the .380 cartridges were made for use in Colt pistols..
100-1000 depending on specifics
check it out at: http://stevespages.com/page7b.htm
pistol made about 1920
100-500 USD
Impossible to answer without the serial number. You can also contact Colt