Carlos_H:  Welcome to the KCA Forum.  Your Stock appears to be a shortened Rifle Stock with a nicely stamped '1900' Cartouche (acceptance mark).  Your wood seems light in color and to have a nice 'tiger stripe'.  It is probably Italian Walnut, which occurs in some 1899 & 1900 made Krags, due to a shortage of seasoned US stock blanks at that time.  More and clearer photos would get more answers.  (Attached photo is my Italian walnut stock for comparison).

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