CS Marked French Infantry Musket, Percussion Conversion, believed Confederate

CS Marked French Model ANIX or 1822 Infantry Smoothbore Musket, flintlock-to-percussion conversion using the bolster-type method, a conversion method used circa the 1850s. Lock-plate is marked in script, "Mfre Nle de St Etienne" or "Manufactured at the National Armory of St. Etienne [France]". The Nle (National) marking is believed to have been used on these circa 1848-1852. Caliber is ~.69 and barrel is smoothbore.
Overall length is ~60-1/8"; barrel length is ~44-3/4". Various French inspection stamps in various locations. The most unusual mark is obviously the "C.S" marking above the arsenal script on the lock-plate. There is an odd marking above the "C.S" that appears to be either a "grenade" or "bomb" or perhaps and odd "palmetto"? I believe the "C.S" is clearly for Confederate States but very obviously, I cannot make that guarantee; I have no proof. It looks very convincing though. Surplus French muskets converted to percussion were used by both sides during the early stages of the Civil War. Many French 1777 and Belgian flintlock muskets were converted to percussion at various Confederate arsenals, most notably arsenals in Virginia and South Carolina and used by the South during the Civil War; this is documented.
Various minor stock dings, scratches, nothing major. Thin hair-line crack in stock at the wrist.

Used gun; antique; not sold as a shooter; no warranty implied or given. Please have any gun you intend to shoot - in any fashion - checked by a competent gunsmith.