Whats the difference between a 1979 S type 2 proof Silver Dollar and a 1979 S type 1 silver dollar?

The difference is in the 'S' mint mark which is found on the left side of the coin just above her shoulder. The Type 1 dollar's 'S' is like a blob - it is not well defined and is somewhat fat. On the other hand, the 'S' on the Type 2 dollar is more clearly defined and is clearly an 'S'. The Type 2 dollar is much more scarce than the Type 1 dollar.