The blued Colt first pictured is a 1927 pre NM gun in 99% and about as rare as a Colt gets. The finish is a high polished blue. Less than a a couple dozen have been documented to date. Even fewer are still known to exist.
If you were well versed in Colt you would have realised the date of manufacture from the serial number.
The second 2 are early to mid 1970's guns as you can easily see from the serial numbers and roll markings. Those guns are now 30 some years old.
The last two ( the staibless and CE) are obviously Series 80 guns ( a major design change on the 1911 BTW) and produced in the late 80's.
All the guns but the 1927 NM gun are recent, best grade, custom 1911s based on Colt frames and slides. Think of them as something like BBII
Colt offered custom 1911s from the start of manufacture. By the mid 1920's there was already a cottage industry modifying and customising the 1911 for higher preformance. By the early 1930s 1911 pistolsmithing for performance was a healthy industry.
While Browning did a number of designs for Colt previous to the 1911. The GI model 1911's design is clearly traced to the 1908 prototypes.
Here is a 1917 example:
That would be a expensive paint job on a 911.
Two more from the 1920's
