Historical clue formulations

• Token of past times — 2024-01-22
• Keepsake — 2018-05-08
• Class ring, e.g. — 2014-11-16
• It serves as a reminder — 2014-01-17
• Token — 2005-07-24
• Token — 2004-07-03
• Ticket stub, sometimes — 2000-11-16
• Souvenir — 1995-09-01