The $300 is not .999 silver same as all the $200s. According to the specs, it is silver/copper, which means it has a 6 troy oz. center of .999 silver and an outer rim of copper that is silver clad. That's why it doesn't say .999 fine silver on it, because it would be misleading.

$200's are 12 tr. oz. solid silver, and the first $300 was too. The rest of the $300s are only 6 troy ounces of silver. That is a very huge difference.