I would considered that a slight off center strike. Misalignment die would be on only one die. It's slight but it's definitely a keeper!
It looks like copper. Would "struck on rolled thin planchet" describe it? The strike is weak. It's almost half the normal weight. Could the stock have been rolled that thin?
I am not sure but I have a 1981 that is also 1.8 ,this one I thinking of buying it but even the owner is not sure if it is a split planchete or a foreigner plan..
The weight tells me that this is struck on a planchet intended for New Zealand 1979 1-cent. I have a similar one from 1980... http://caimages.collectors.com/coinimages/30332/27868289/1c_1980_ERROR_NZ_PCGS_MS64RD.jpg
You know, the Canadian coinage is really growing on me. If found a couple of 1940s while cent roll hunting. I really like those king George cents. I may start working on a set. I'll have to get them from eBay though. I've only found 2 out of 12-14 boxes of Lincolns!