Can't say without seeing it, but as has been pointed out...the initials "csa" inside the lock plate does not stand for Confederate States of America. Usually the lock maker stamped initials or their name inside the plate above the mainspring so if it failed inspection or was otherwise defective, the gunmaker who filled the contract would have some recourse. There were dozens of component makers who provided hand made parts and assemblies to the gunmakers that then performed the final assembly and filled the contract. For an excellent and detailed description of the Birmingham system of manufacture with information on all the various parts makers, see John D Goodman's chapter in Samuel Timmins (editor), Birmingham and the Midland Hardware District (London, 1866). Goodman was the Chairman of the Birmingham Small Arms Trade during the US Civil War.
The Birmingham system of manufacture is also covered in some detail in the book Suppliers to the Confederacy pages 54-62.