those threaded holes in the top yoke are for mounting the clip-ons. They are above the yoke on 1100s, unlike 750s.
Pic of bottom of top yoke? If it has 4 threaded holes for mounting the clocks, they are 99% sure 1100K.
with some luck only the valve will need replacing.
More realistic, piston and possibly head also f*cked. You will need to open her up and inspect the damage.