well we know it is a model 1898 the serial number does help though, it is a sport stock on it and seem to have a after market site on the from and some form of rear peep site. The rear site does appear to be the one for the Krag but you did not show a good picture of it. and are the two screw hole on the top of the barrel behine the barrel band? and what is the length of the barrel and of the stock.