Multiple coin die caps

I would like to pick the brain of some of the veteran US error collectors. I am curious as to how common die caps are, with multiple struck coins?? Obviously the end member is this monster

http://stacksbowers.com/Auctions/AuctionLot.aspx?LotID=370659

But, generally speaking, are there 2 to 4 coin die caps out there? If so, I assume you only find these in the softer metals, like 1-cent strikes?? Anyone ever hear of a 6 or more coin cap??

The reason I am asking is because I found a Canadian example (3 coin cap), and I am trying to do a little background legwork on an article I intend to submit to Errorscope (CONECA's journal). As far as I know, due to the lower mintages, my Canadian example is probably unique. I promise I will post some photos here, after the article is submitted/accepted for publication.

OK - after a bit more digging, the terminology that seems to be used in the US are 'bonded coin errors'. I did find a single example here: http://www.studium.com/graphics/coins/lbondedset.gif

So the search begins anew, with new key words...

 

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I just wanted to extend my thanks to all of those who contacted me, and helped me find background information.

http://www.cointalk.com/threads/canadian-1-cent-nested-triplet-error.233077/

 

There are bonded coin die caps in about every US coin denomination . these were mostlikely smuggled out of the mints. you can google bonded coin images then click on bonded coin images and see a few examples of some good ones. even your 3 coin group is there. these occur in all denominations from cent to dollar .

 

There are bonded pile-ups known that incorporate 30 planchets or more. You don't need a "soft" alloy, either. Dimes and nickels are sometimes involved.

 

That monster at Stacks last year must have been something to see in hand...

 

Fair enough, but are you referring to the clad coinage of the US coins?? I have never seen, or heard, of anything similar with the pure nickel or nickel-plated steel coins struck in Canada....

 

I also haven't seen any bonded steel coins or ones made out of pure, elemental nickel. But I wouldn't be surprised if some turned up. Melting point doesn't seem to be a factor as I've seen bonded aluminum coins, and aluminum has the highest melting point of all.