Historical clue formulations

• Certain dumbbell weight: Abbr. — 2018-05-27
• Dumbbell weight abbr. — 2012-08-05
• Like some dumbbells: Abbr. — 2009-12-18
• Potato sack wt., maybe — 2005-03-08
• Potato sack wt., maybe — 2001-08-01
• Wt. of some flour sacks — 1999-11-19