Historical clue formulations

• Weight plate units: Abbr. — 2026-05-22
• Units in a tonne: Abbr. — 2026-05-19
• Metric wts. — 2025-07-16
• Metric measures: Abbr. — 2017-01-10
• Metric weights: Abbr. — 2016-08-24
• British scale divs. — 2014-03-19
• Metric wts. — 2011-07-24
• Metric weights: Abbr. — 2011-02-08
• Metric weights: Abbr. — 2010-10-24
• Metric wts. — 2007-01-10
• Metric wts. — 2006-12-31
• Metric wts. — 2001-05-10