I have a 16 gauge A5 that has a serial X301** From what I have read this appears to be a 1925 if you go by the numbers but what is baffling me is the X in front of the serial. Above the serial on the bottom of the receiver is marked FN. It is marked Made in Belgium. The barrel is stamped 2 3/4. I have read the forums but still unsure. Any help would be greatly appreciated.