21mm [1 farthing, 1 penny]. 28mm [50 pence, OLYMPIC 50p]. 22mm [3 pence - yellow, 20 pence]. 23.5mm [1 shilling, NEW £1 coin from March 2017]. 16.5mm [3 pence - silver]. 20mm [6 pence]. 24mm [5 new pence - big].
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