By the serial number. Try proofhouse.com
Normally, it's on the barrel.
To determine the year of manufacture for a Colt 1911 .45 based on its serial number, you'll need to reference Colt's serial number charts. The Colt 1911 was produced from 1911 onward, and the serial numbers were assigned sequentially. For example, serial numbers starting with "C" typically indicate a production year in the 1940s. For a precise year, consult a detailed Colt serial number lookup or Colt's records.
as best I can determine about 1880
Call Colt
With the serial number that you have provided,your Colt Model 1911 was made by Colt in the year 1918.
Go Here...http://proofhouse.com/colt/ Regards
The date of manufacture is determined by the Colt model type and serial number. See: www.proofhouse.com/colt/index.html
It tells the year of manufacture of a Colt.
You will have to call Colt
what model colt ??
You will have to call Colt to find out.
you must provide the serial number in order to determine the mfg. date.................... on any firearm.