Historical clue formulations

• Seemingly timeless — 2021-09-27
• Classic — 2019-03-17
• Ancient — 2013-07-21
• From way back — 2012-12-23
• Timeworn — 2012-12-09
• Antediluvian — 2012-06-03
• Steeped in tradition — 2012-01-21
• Ancient — 2011-04-29
• Venerable — 2009-09-20
• Ancient — 2007-02-05
• Ancient — 2006-09-27
• Ancient — 2006-05-26
• Time-honored — 2006-01-17
• Antediluvian — 2005-09-11
• From time immemorial — 2005-01-25
• Long-known — 2004-02-29
• Ancient — 2003-04-12
• Ancient — 1997-02-02
• Ancient — 1996-10-07