Artilleryman:
On The listing of, KNOWN SURVIVING CIVIL WAR CANNON, Wayne Stark had sent to me on April 19th 2005, page 38 there is one 12-pdr Confed iron how, M1862, Foundry Tredegar, FDY#1507, Year 62, Weight 850.
This one is Privately owned and located in Richmond, NY. I will check again but I didnÂ’t see any others listed in private hands.