Hello, I am Silvana from Argentina. I have an FN superposed 12 gauge shotgun, I belive it's a model Liege, the markings on the barrel are: "Fabrique Nationale Herstal Made in Belgium" and "Patent Pending Special Steel 12 GA Shells 2 3/4" Serial number is LB3RN013##, located under the barrel lever. The serial numbers I have seen are with L13 prefix instead of LB3, markings for the manufacturer are like the ones on FN pistols, but serial number is more like browning manufacture, any ideas of where this number came from?? Thanks in advance. Regards.