Historical clue formulations

• Mountebanks — 2021-12-04
• Basketball's jab step and others — 2019-11-16
• Forgeries — 2017-11-12
• Art buyers' worries — 2010-01-20
• Museum embarrassments — 1999-07-20
• Humbugs — 1998-11-28
• Impostors — 1995-06-08
• Mountebanks — 1994-11-18