Historical clue formulations

• Opening of an account — 2019-05-24
• "If memory serves ..." — 2019-04-15
• "Thinking back ..." — 2014-01-17
• "If memory serves ..." — 2010-12-01
• "If memory serves …" — 2006-09-18
• "Come to think of it" — 1996-04-13