Historical clue formulations

• Invariably — 2024-07-16
• "Yours truly" alternative — 2020-03-10
• Alternative to "Sincerely" — 2017-07-15
• Letter closing — 2017-01-21
• Unfailingly — 2016-08-23
• "Yours truly" alternative — 2014-09-10
• Closing to some letters — 2010-12-05
• "Yours" alternative — 2010-01-31
• "Yours" alternative — 2008-11-01
• Invariably — 2008-06-15
• Familiar complimentary close — 2003-12-28
• Invariably — 2002-01-24
• Letter ender — 1996-08-10
• Letter closing — 1995-04-16
• Letter closing — 1994-08-21