Proofhouse.com has Colt sn data.
probably made by colt in 1943. If your slide reads Ithaca, then it is on a Colt frame. That is not unusual....................
400-1000
The Colt 1878 frontier model with serial # 35369 was produced around 1896.
Colt has never produced a model M1911 that is powered by CO2.
The Colt M1911 was designed 1911.
if you are referring to the model 1911 Colt pistol with serial number 444810, then it was made by Colt in 1918........................
the serial number is too HIGH for 1911 military pistols........
would need a serial number to answer the question.....................
1918
check barrel and frame for model
You can find a list of Colt M1911 and M1911A1 production serial numbers at http://www.coolgunsite.com/pistols/colt%20production.htm. Going by the numbers in your question (7071), it looks like you have a M1911 that was made for the Navy in 1912, the first year of production.