Historical clue formulations

• Façade feature — 2016-06-07
• Mark in the intersection of 58-Across and 43-Down — 2016-06-01
• Letter attachment? — 2013-12-12
• Façade part — 2004-05-05
• Every garçon has one — 1997-10-30
• Addition to a letter — 1995-02-12
• Facade feature — 1994-04-17