Historical clue formulations

• Abbr. before a year — 2025-11-26
• Abbr. next to a year on a company sign — 2025-11-01
• Abbr. before a year on a cornerstone — 2025-01-20
• Cornerstone abbr. — 2024-05-23
• Abbr. below the name of some businesses — 2023-12-08
• Founded: Abbr. — 2022-10-31
• Abbr. on a cornerstone — 2020-11-15
• Abbr. on a city limits sign — 2020-07-12
• Begun: Abbr. — 2020-04-25
• Cornerstone abbr. — 2019-08-21
• Abbr. on a brewery sign — 2019-03-13
• Abbr. on a college entrance sign — 2018-08-30
• Abbr. on a city boundary sign — 2018-07-06
• Abbr. on many a cornerstone — 2018-04-02
• Abbr. on a foundation stone — 2018-01-20
• Abbr. on a sign at a town line — 2017-11-01
• Abbr. before a year — 2017-06-08
• Abbr. before a date — 2017-04-06
• Abbr. on a company's sign — 2016-10-23
• Founded: Abbr. — 2016-08-04
• Abbr. found on some corporate logos — 2016-04-14
• Abbr. in the Guinness logo — 2016-03-24
• Abbr. preceding a year — 2015-09-13
• Abbr. on a town's welcome sign — 2015-06-14
• Founded, on city signs — 2015-02-15
• Abbr. before a cornerstone date — 2014-12-15
• Cornerstone abbr. — 2014-10-08
• Abbr. before a founding date — 2014-06-18
• Abbr. on a historic building — 2014-05-29
• Abbr. before a date — 2014-04-19
• Foundation stone abbr. — 2014-03-13
• Abbr. before a year — 2013-07-20
• Set up: Abbr. — 2012-12-22
• Abbr. before a year — 2012-08-05
• Abbr. on many a cornerstone — 2012-04-19
• Cornerstone abbr. — 2011-05-29
• Cornerstone abbr. — 2011-05-11
• Cornerstone abbr. — 2011-01-11
• Cornerstone abbr. — 2010-11-14
• Cornerstone abbr. — 2010-10-20
• Abbr. on a city limit sign — 2010-08-10
• Cornerstone abbr. — 2010-06-29
• Founded: Abbr. — 2010-06-28
• Abbr. sometimes before a date — 2010-05-29
• Abbr. after an institution's name — 2009-12-12
• Founded: Abbr. — 2009-11-05
• Abbr. before a date — 2009-10-11
• Town line sign abbr. — 2009-09-09
• Cornerstone abbr. — 2009-01-26
• Abbr. accompanying a college name — 2008-03-27