Historical clue formulations

• Marble made of metal — 2023-11-15
• Metal marble — 2016-03-06
• Agate alternative — 2011-02-13
• Shooter banned from tournaments — 2005-03-12
• Agate alternative — 2004-02-07
• Certain marble — 2003-11-08
• Metal marble — 2003-06-01
• Playing marble — 2001-08-19
• Metal marble — 1999-11-28
• Certain playing marble — 1998-12-23
• Shooting marble — 1997-06-23
• Heavy marble — 1996-11-03
• Playing marble — 1995-07-01