Two Civil War Vintage Cannons are listed on "Known Surviving Civil War Cannon in Geographical Order" as of April 19, 2005 for Raton, NM.
The one in the photograph is a 12-pdr bronze field gun Model 1841 made by Ames in 1842, serial #6 inspected by JWR and with the weight of 1768 pounds.
The second one (not shown) is a 12-pdr bronze Napoleon Model 1857 made by Hooper, in 1863, serial #142, inspected by TJR and with a weight of 1207 pounds.
(There is a note on this list about this gun that it was captured by CSA at Chickamauga, GA.)