The standard caliber is .45 acp. That is a short fat pistol caliber that fires a 230 grain bullet at about 800 feet per second velocity. Lighter bullets down to about 185 grains are available, and they travel faster, possibly as high as 1100 f.p.s. The model 1911 pistol is a semi-automatic, not to be confused with an equally famous revolver made by Colt, often chambered in what is also called .45 caliber, but that model 1873 revolver would use the .45 Colt or .45 Long Colt cartridge, which is a rimmed revolver round, much longer in size that the .45 acp, and firing a heaver bullet at similar velocity.
45 ACP
If you mean the standard Caliber of a 1911 model colt pistol,then this was chambered in the caliber .45ACP.
made about 1960
50-10000 USD dependinn on specifics.
It could be any pistol chambered for one of the several handgun calibers in the .45 family. The most famous .45 handguns are actually chambered for different rounds. The Colt model 1873 "Peacemaker" was offered in .45 Colt or "Long Colt" caliber, among other calibers. And the famous Colt model 1911 was sold in a caliber called .45 ACP (automatic Colt pistol). The .45 ACP is not interchangeable with the .45 Long Colt, but they both fire big heavy bullets at similar velocities.
The Colt 45 was called that since it was made by the Colt company, and fires a .45 caliber bullet.
Colt 1911 .45 serial # 171885 was manufactured in 1917.
Traditionally they carry the military-style Model 1911 Colt .45 caliber semi-automatic pistol.
The caliber of this weapon is .45 ACP, or it's full name is .45 Automatic Colt Pistol.
much depends on condition and mfg date.........from $400 to $1200 average
The Colt 1911 was designed in 1897 and adopted by the US Army in 1911.
the standard price of a .45 colt 1911 is at least $1300 on sale, but i have seen them go for $300-$400 in a .22 caliber model but highly unrecommended for my personal carry. i have a .45 colt 1911 from WW2 carried by a fighter pilot and is worth $2000 at least, and was given to me by my father who received it from his uncle who was in WW2. so i got really lucky. i love the .45 colt 1911 and is to me, way more reliable than most firearms manufactured today.