AdamMY wrote:Check out http://en.wikipedia.org/wiki/Pu-erh_tea Specifically the section about recipes.
First two digits *are* the year that blend was first made. Note I am not entirely sure those numbers are accurate, or more just assigned for posterity sakes. As occasionally you see people selling a 30yo 8582 or similar. But that is a whole different debate.
3rd digit *is* leaf grade. Again quite debatable.
4th digit indicates which factory the tea was produced at.
Catfur wrote:AFAIK leaf "grade" doesn't refer to quality, but rather to leaf size and is an average.