The 1861Colt did have the Naval Battl scene, and the (Original Colt) had the serial number there where the patent note is. If there are proofmarks, it is European, likely Italian. Is the cylinder frame brass, or just the griupframe? Actually an 1861 should have no brass parts. There may be a makers name on the bottom of the barrel, hidden by the reloading lever. To be legally imported (now) the country of origin must be stamped, if it was made before that law, it might not. No American made gun has proofmarks.