You will have to call Colt or provide the serial number.
With the serial number that you have provided,your Colt Model 1911 was made by Colt in the year 1918.
Your Colt model of 1911 dates to the year 1918,with the serial number that you have supplied.
You will have to call Colt
My Colt records do not show any 1911 model with a serial number starting with SS.
A Colt 1911 commercial .45 with that serial number was made about 1971
@1913
1917
about 1925
Proofhouse.com has Colt sn data.
Proofhouse.com has Colt sn data.
Can't be answered without the serial number.
You will have to call Colt with the sn to find out.