i have not seen that sight either, as the pat. date is 1914 on the sight and the rifle was made in 1915, i,m pretty sure it came with the rifle,was it a special order? i don,t know,but i like it and may take it off and keep it if i sell the rifle,i have original era other sights to replace it with.(dove tail is standard 3/8). here is the 99 savage in 250-3000 made in 1954, i picked it up at my ffl,s this morning. bore is ex and the rest is in very good condition, not factory D&T,ed and had sling studs non factory installed. but as i don,t see many for sale i just got it. eastbank.