Colt 1911 .45 serial # 171885 was manufactured in 1917.
Your colt 1911 was made in 1924.
your 1911 serial number indicates your 1911 was made by Colt in 1914
Sn goes beyond published references. You will have to call Colt to find out.
Manufactured in 1978.
1918
By it's serial number.
Your Colt model of 1911 dates to the year 1918,with the serial number that you have supplied.
Your colt 1911 was made for the U S GOVERMENT in 1919.
The government issued Colt with that serial number was manufactured by Colt in 1942.
The Colt government 1911 .45 with that serial number was made in 1944 by Remington Rand
1917