Hello Ganapati,
Your kris looks like a quite good piece but don't be surprised to learn that it does not date from the 12th century. This confusion is entertained even by reputed kris experts like Tammens (see vol. 1, pages 117, 183, 189 for instance). Please keep in mind that the krisses from the Pajajaran period probably disappeared from the market a long time ago and that the genuine ones would cost a fortune
Regards