Some Estonian trivia for you. The original 1-kroon coin was made of white metal, and by some coincidence had the exact weight, thickness and diameter of a German 1DM coin. Since the currency was pegged at 8EEK to 1DM, this made the Estonian coins very popular in German vending machines.
I don't remember exactly when the white coin was phased out and replaced with the yellow, but I think it was before the paper 1-kroon note was taken out. Certainly some time before Germany adopted the Euro.
The other coin is the brand new 2008 mint, with the 90th Anniversary logo.