For your consideration, my 12ga 50588 is stamped with S/N: U243XXX. The Mossberg box label indicates a "Packed On Date" of 05/29/12 which flushes with my purchase in February of 2013.
Proud owner of a 2012 Cruiser purchased hot off the assembly line. Has performed flawlessly but have recently gotten the mod bug. Presently installing wood furniture.
Happy New Year!!