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Weights of British coins

The ways in which one can procrastinate are many and varied, and one evening at approximately 3:30am, I decided I would quite like to be able to get a rough estimate of how much money I have in my 1p jar. To do this, I weighed various pennies individually, and because I couldn't sleep, I did 2ps too.

Coin Condition Weight (±0.01g)
1p Dirty, 1980 3.59g
Quite clean, 2004 3.52g
New, 2008 3.53g
2p Dirty, 1978 7.08g
Quite clean, 2007 7.11g
New, 2008 7.03g