I just went through a roll of 2010 loon loonies from the Wpg
RCM and found 4 out of 25 with the same "pedestal shaped" mark at 6 o'clock on the Obverse under the Queen's bust. It doesn't look like die clash because nothing lines up from the Rev.
Any theories?
The first 4 pics are microscope shots of the 4 different coins, the 5th pic is a duplicate from my digi-cam:




