It's a different metallic composition than modern coins
Coins from 1858-1859 (Province of Canada) weigh 4.54 grams with a diameter of 25.4 mm. They have a composition of .950 copper, .040 tin, .010 zinc. ( http://www.jandm.com/script/getitem...CID=3&PID=76 )
vs. the moderns (since 1942) of .980 copper, .005 tin, .015 zinc.
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