Go to Colt's website and request a manual.
$900
Call Colt and they will tell you.
Go to: http://stevespages.com/page7b.htm Scroll down to Colt MKIV series 80 .380. It will give you a copy of the manual with everything you need.
10-500 usd
value depends on overall ondition............
Wall hanger to 400 USD depending on condition.
Try proofhouse.com.
Assembled improperly.
You can download a manual from the Colt webiste; ask a gunsmith for help
100-600 USD
50-500 usd
Check the auction sites for current values.