Related Clues:

• Alumni grouping
• Wine-bottle number
• 2012, for one
• 2013, e.g
• Classic car datum
• 2005 to 2006
• 2012, but not 2013
• Sommelier's stat
• After this, buy a new calendar
• Cornerstone datum
• Class ring datum
• Graduate's affiliation
• 1492, e.g
• About 687 Martian days
• It's one in four