You will have to call Colt with the serial number to find out.
Colt 1911 .45 serial # 171885 was manufactured in 1917.
The Colt government 1911 .45 with that serial number was made in 1944 by Remington Rand
don't find any 1911 45's serial number ending with a letter. ???
Your Colt model of 1911 dates to the year 1918,with the serial number that you have supplied.
1918
$500
check pistol aagain. serial number appears to high for the 1911 military
None with a LH prefix in the serial if you talking about a 1911.
A government issue Colt 1911 .45 with that serial number would be 94 years old. It was made in 1918.
1917
100-10000 USD
1918