1950
the 45. colt combat commander i worth from 1100.00 to 9000.00 depending on the gun research carefully.
Colt was one maker who made the GATLING gun.
It was made in the 1970's and the BS means Blued Steel. Probably a Colt Combat Commander. Worth about 600-800 dollars depending on condition maybe more.
Legand has it Samuel colt made a gun that could kill anything
1924
Potato Digger
If you want to know when it was made, you need to call Colt.
Colt makes a 1911-A1 Pellet gun made by Umarex. I know of no BB gun unless you are asking about an Air Soft gun. The Pellet gun is very good. I can not answer about an Air soft gun.
about 1973
The repeating hand gun
1873
You will have to call Colt to find out.