First of all, no commercial Colt Model O pistol carries a name of "1911" (except the recent reproductions). "1911" is a military designation only, and should not be used in connection with a commercial pistol.
Until relatively recently, the names for the 4.25-inch Model O pistols were either "Commander" or "Combat Commander." The former has an aluminum alloy frame, while the latter has a steel frame.
The collet bushing is what makes a Model O a "Series 70." The Commander and Combat Commander have never had a collet bushing so cannot be "Series 70" pistols. Notice that there is no "Series 70" marking on any Commander or Combat Commander, unlike a Series 70 Government Model or Gold Cup that is marked "Mark IV/ Series '70" on the slide. The always unreliable "Blue Book" makes the improper reference to "Series 70" and "Pre-Series 70" Commanders, which undoubtedly is a factor that has caused some to use this incorrect reference. If there is no such thing as a "Series 70" Commander or Combat Commander, then there can be no "Pre-Series 70" Commander or Combat Commander either.
Perhaps the "Blue Book" error was generated when Colt put a "70" prefix in the serial numbers of Commanders and Combat Commanders for a while. The serial number prefix is a mere coincidence and has nothing to do with the characteristic that makes a Model O pistol a "Series 70," the collet bushing.
While I am reluctant to disagree with paul45, I think the proper nomenclature for a non-Series 80 4.25-inch Model O pistol is just "Commander" or "Combat Commander," unless one is referring to a Series 80 pistol, in which case, add a reference to "Series 80," such as "Series 80 Combat Commander." Others may disagree on the best way to distinguish between "Non-Series 80" pistols and "Series 80" pistols, but there should be no reference to "Series 70" in relation to any 4.25-inch Model O pistol.