SAA or M1911?
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.
You will need to check with Colt Customer Service.
Colt's customer service says 1996.
Your colt was made in 1916.
The list I have shows a Colt new service with that serial number as being made in 1915.
about 1903
1917
about 1903
You will need the model and type of gun- and check with Colt customer service.
Late 70's. Your best bet is to call Colt.
Around 1916