If the gun never had a serial number, it could be what was known as a "tool box" gun. These guns used a frame which hadn't been stamped with a serial number and was assembled by a worker at the plant which manufactured the gun and smuggled out in his tool box.
None
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.
The the first ones were manufactured in Spain, then Germany followed suit. China manufactured unlicenced copies of the Spanish pistols, and the Brazilians manufactured a modified variant of the German pistols.
Cocoa, Florida United States
Data not yet available
1,000
Luger and Mauser pistols.
Crescent Fire Arms, Norwich, Connecticut.
Redhawk .41 Magnum pistols were first manufactured in 1979.
@ 30 yrs
Started producing in early 90's and are still being produced today.
More information needed. Now? 10 years ago? Which model? Etc..