LETTER/YEAR DESIGNATORS On the back of your Panerai is a letter designator. This letter represents the year in which your watch was manufactured. Below is a list of these letters along with the associated year of production. Use this list to get a general idea as to how old your Panerai is! O: 2012 N: 2011 M: 2010 L: 2009 K: 2008 J: 2007 I: 2006 H: 2005 G: 2004 F: 2003 E: 2002 D: 2001 C: 2000 B: 1999 A: 1998 No letter designation: 1997 PRODUCTION NUMBERS You'll also notice that there are numbers following the letter/year designator on the back of your Panerai. For example my PAM 111 reads, 2287/2500. This simply tells me that my watch is #2,287 of a total of 2,500 PAM 111s produced. Combine this information with the letter/year designator and you'll learn that my PAM 111 is #2,287 of 2,500 pieces manufactured in the year 2006. Pretty cool, huh?