Historical clue formulations

• Fin beneath a surfboard — 2024-12-04
• Surfboard stabilizer — 2019-12-26
• Keel extension — 2013-12-07
• Surfboard fin — 2012-07-10
• Piece supporting the rudder — 2004-07-25
• Keel extension — 2002-10-10
• Rudder support — 1999-03-05
• Keel afterpart — 1995-12-16