Is it possible you mean an AR 15 made with an elcectroless nickel finish?
No serial number given. You will have to call Colt.
100-1000 USD or so depending on specifics.
serial number 115569 in an SP 1 does not seem to exist specifically. 15569 is 1970 83400 is 1978 SP 360200 and lower are classified under 1978
Try looking at this, it may give an idea. http://biggerhammer.net/ar15/ar15serial.html Mike aka nfmMike @ ar15.com forums
Yes
You will have to call Colt
1/2 28
100-800 usd
100-1500 USD or so
100-1000 or so
In 1974.
100-500 USD.