7up uses an A-L and a M-X,A or M would be january,L or X Would be December,and the # would be the days of the year preceded by the year,example,E5151,E would = the 5th mo.,5 would = the year2005,151 ould = the 151st. day of the year,the rest is where its bottled,but honestly,freshness is paramont to any brand,pride,integrity,honesty,commitment.