Historical clue formulations

• Exemplar — 2025-10-30
• Ideal — 2019-08-16
• Model of excellence — 2018-09-03
• Ideal — 2017-07-30
• Ideal — 2011-05-08
• One worthy of emulation — 2011-01-01
• Prime example — 2006-11-17
• Model — 2006-06-04
• Perfect role model — 2000-01-07
• Nonpareil — 1996-08-21