When the Canadian 2 dollar bi-metal coins first came out in 1996, there was a small issue. Wikipedia refers to it as "Seperation of metals"... "A failure in the bimetallic locking mechanism in the first batch of Toonies caused some coins to separate if struck hard or frozen. Despite media reports of defective toonies, the Canadian Mint responded that the odds of a toonie falling apart were about 1 in 60 million. It is against the law to deliberately attempt to separate a toonie. Defacing coin currency is a summary offence under the Canadian Criminal Code, section 456" http://en.wikipedia.org/wiki/Toonie Back in 1996/1997, when I received the coin in the attached photos, it had already been separated. Looking at it, it probably didn't take much, must have been very loose. There is not a lot of damage or scratches on the ring or center, both parts of the coin are straight and flat.
You could try and sell it as a "holey" dollar and the "dump". I like it. I had a Mexico 2 Peso that was partially out of position, somehow misplaced it.