Historical clue formulations

• Single-masted vessels — 2026-07-23
• Vessels of the Napoleonic Wars — 2014-12-26
• Seagoing vessels — 2013-08-01
• Pleasure boats — 2012-12-16
• Cousins of cutters — 2009-08-15
• Sailing vessels — 2007-04-09
• Single-masters — 2003-02-27
• Single-masted vessels — 2002-11-07
• Some fore-and-afters — 2002-06-19