Historical clue formulations

• Oarlock — 2012-04-05
• Oarlock — 2006-01-19
• Oar pin — 2005-05-22
• Oar pin — 2005-03-27
• Oarlock — 2002-10-08
• Pin of a sort — 2002-09-06
• Gunwale pin — 1999-12-19
• Oarlock — 1999-06-23
• Oar fulcrum — 1993-12-26