$650 to 750
Wall hanger to 500 USD. Need a better description to narrow it down.
You tell me?
Maybe 5 dollars retail
"double eagle penny" is kind of an oxymoron. A double eagle coin has a face value of $20. However, a gold coin is probably worth considerably more than face value.
The American Eagle Bicentennial quarter with the double eagle isn't overly valuable. In good condition, they can sell as high as $50 but no higher.
Please look at the date and mintmark again. The 1864 Liberty Head double eagle was only struck at the Philadelphia & San Francisco Mints.
The only legal example sold for $7,590,020 in July of 2002.
Colt has not offered a AR15 in 308
About $2.
What is the grip made of?
What date? What condition? What mint mark? Please post a new question with those details.
If you call Colt they will tell you when it was made.