Rifle is all 100% original Colt and in perfect excellent condition. Has been fired.  Perfect finish on the outside and only minor normal wear marks on the internal parts.  Has origional sling and one 20-rd mag.  Serial number is SP005XX Thanks in advance.

If all is factory original then you could be looking at right around $2500. But there are alot of things to look for to ensure its 100% original.

Most folks don't even know all of the stuff a 1964 SP-1 came manufactured with. The barrel is the first give away. If it even mentions chrome bore or chamber its not original right there. Era correct will only have a "12" or "MP" marking. Then look at the buffer. Not an Edgewater. Ding, Ding, Ding. Again not orginal.

The list goes on for another 5 or 6 items as well.

Not an expert, but believe it should also have an un notched chromed bolt carrier and chromed bolt.

Thank you again for the input.

Yes to all above.
-Rifle has:
-Edgewater buffer
-Smooth bolt carrier and nickle/chrome bolt (inside of bolt carrier is not chrome lined)
-No markings on the barrel except for the very small "M S" stamp right under the front site.
-Three prong flash hider
-Has a big "+" stamp on the right side of the lower receiver at the right side of mag well
-Dimpled in rear push-pin and fire selector
-Smooth rounded front end hammer
-Non trap-door butt stock

It has a very smooth dark gray finish, best I'v seen on preban Colts in years...

Will take some photos later.