FYI - the coins are not underweight, they are under-spec. They do weigh 1 troy ounce. They just don't have the right percentage of gold in them. This was confirmed to me by the guy who broke the story (did the initial testing). There is a report on YouTube that explains the story more accurately (doesn't embed, so you have to watch on YouTube): http://www.youtube.com/watch?v=y9PuUBd8wCY
It would be interesting to see a random test results on the most popular gold cons from someone who has access XRF machine on this forum.
