SN130521 E (for Export) all matching numbers. Early type agent Case with original Colt accoutrements. See also the book: Colt 1851 and 1861 Navies by Robert M. Jordan and Don W. Geri pages 202- 208. Group 5. This serial number fit's within the serial number range of Navies delivered to Australian New South Wales Police only lacking the police markings. Fine and clear cylinderscene. A lot of original finish present. London proofmarks on barrel and cylinder.