Great Britian 1997 Two Pence Extra Metal

I am somewhat a newbie to the coin collecting world, and all I dabble in are US coins so dealing with a foreign coin is way out of my ballpark. I stumbled across this 1997 Two Pence coin in a roll of half dollars of all places. On the obverse next to Queen Elizabeth II nose is a large chunk of metal. On the reverse there are multiple chunks of metal centering mainly around the Prince of Wales symbol just above the 2 and there is a small Cud above the P in Pence and to the right of the 2 as well. At first I thought it was slag but then I noticed that the lower right side of the design was on top of the Cud or excess metal. That tells me it had to be some kind of defective planchet or the likes. Any help would be greatly appreciated.