Historical clue formulations

• Headwear for a monarch — 2025-09-15
• Feature of the Rolex logo — 2024-06-04
• Feature of the Budweiser logo — 2016-11-02
• Royal topper ... or part of the logos of 16-, 21-, 38- and 53-Across — 2015-09-14
• Bonk — 2010-09-01
• Symbol of sovereignty — 2007-05-03
• Conk — 2002-06-22
• Queen topper — 2001-01-23