(The Elusive) 1912 Guatemala 1/2 REAL Silver

I am talking about the 1/2 Real... Not the Medio with the seated figure on the Reverse. I mean the one with the DatedLibertad Script Obv.(Sep 15th...) YES, they all have the dated Lib. Script Obv., The Medio has 3 Mountains and the date on the bottom.The Rare Coin of which I speak has 1/2 REAL with crossing wheatleaves(1912 is the final year of the 1/2 Real b.t.w.-then gees the Medio,Peso Denoms,finally the Quetzal