I' ve heard of a Saco company somewhere, but not as a maker of Colt rifles. Some were made by Sako in Finland and were very fine arms. One model was called the Coltsman.
The forearm tip was canted in a reverse Weatherby manner, as on similar Sakos, and I was left totally cold by that. But unless that put you off aesthetically, they're excellent rifles. And I think some may have had the normal Weatherby style, which was what they should have been.
I've never seen the rifle shown here. A good side-on pic and a close-up of the action would be very informative.
I think Saco Armament was the firm that supplied SIG-Sauer P-226 pistols to the USAF trials that resulted in adoption of the M-9 Beretta pistol. I don't think Saco made guns.
You're probably confusing them with Sako, pronounced as Sock-o. This is the correct pronunciation, according to both the company and to the Finnish Embassy personnel whom I asked, and to a Finnish exchange student who owns one.