i have searched all through the internet for semi key date peace dollars and i could not find a single hint please help!
What exactly are you looking for? The three most important dates for Peace Dollars are 1921, 1928 and 1934-S
Are you looking for values or to buy? The Keys are 1928 and 1921 by their mintages and survival rate, then it's the 34-S and the higher the grade the more valuable. Of course, the 27-S, 27-D, 35-S, 28-S and 24-S are semi-keys mostly due to their poor survival rate in MS grades. All S and D, with the exception of 22 and 23 dates, are valuable in mint state condition. As a whole, the semi-keys depends on if your looking at grade or just mintages alone.
Then there is the recent Redbook addition and only major Variety in most price guides which is both out right rare and a condition rarity with only a couple dozen known in UNC