Is this a plated coin? If so, these could be areas of subsurface
corrosion that lifted up the plating and eventually "popped". Or it
could have begun as small punctures in the plating that allowed
corrosive substances to begin eating away at the underlying metal,
creating the same sort of effect.
I suppose it could have been intentionally damaged as well. These
don't look like bubbles that arise from heat damage.
--- In firstname.lastname@example.org
> You can have a look at:
> Please click the image for a larger picture with full detail.
> The thing is that the bubbles came after strike and they are vey high
> and big, really odd. The bubbles mantain the design in the date 2003,
> so it's all after strike. The coin is Spain 5 euro cent and about a
> nickel size.
> Do you think the coin was intentionally damaged???