Boxed Japanese Colt 3X scopes usually go for $200 and up on eBay. I think I saw one red-box USA scope go for well over $400, but saw another that someone "stole" for under $300, but that was years ago now. If you want a USA scope and see one, bite the bullet and pay what it takes to get it. Not many come up for sale.
"Vintage Colt AR-15 3x Scope with standard cross hairs, Made in U.S.A. with the original factory red box, Made in the 60's. Wear on mount and knobs, Scarce! Used-$695.00 plus shipping cost,add 3% for credit card purchase. Please call or e-mail us if you have any questions or need more pics."
I saw that scope and corresponded with the seller, who claims it is one of 12 packed with "green rifles" in 1964. It is made in Japan.
I have questioned that statement, since the AR-15 did not come out until 1964 and I never heard of "green rifles." I do not believe the scopes were manufactured in Japan until the late 1960s or later.
I have a U.S.-made scope that came in a red box. I have asked for who is shown as the owner of Colt on the box and papers, which might give a clue. I plan to try to find the first appearance of the scope in my Colt catalog collection when I get home.
The seller's representations do not seem possible to me, but the seller seemed offended by my challenge so who knows what more I will find out.
What one can get some new scope for is irrelevant. We were discussing a scope about 40 years old that is a collectors item now. If one were found, it probably would never be used as intended. Mine is not. It remains new in its red box, and makes a nice accessory to my three-digit AR-15.