I think I figured this one out. The planchet is likely for a 2000 Ecuador One Centavo. I also noticed that it sold recently for about $4300 USD / $4700 CDN. It looks like the market for Canadian error coins is quite healthy at the moment.
Its a little heavy for a penny and a little light for a centavo, apparently the centavo is made of brass and this coin appears to be copper...http://www.coinscan.com/for/ecu.html
I assumed the difference in weight may have been due to a small amount of the coin being sheared off when it was struck. Are there any possibilities which are more plausible?
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