Historical clue formulations

• Windows upgrades, perhaps — 2025-10-26
• You can see right through them — 2025-08-09
• Window units — 2022-07-10
• See-through items — 2022-05-06
• 673 parts of the Louvre Pyramid — 2022-02-20
• Philatelist's collection — 2019-12-07
• Glazier's supply — 2015-02-22
• Stamp purchases — 2013-08-10
• Tiffany features — 2012-07-27
• Window features — 2009-01-05
• You can see right through them — 2007-01-05
• Stamp sheets — 2006-10-11
• Philatelic purchases — 2003-04-13
• Philately collection — 2000-01-07
• Window parts — 1998-06-16
• Window pieces — 1998-03-17
• Glazier's items — 1998-03-03
• Glazier's items — 1997-03-04
• Philatelic purchases — 1996-08-17
• Ones in sashes — 1996-01-19