As I was replacing the headset on my Miyata 1000LT, I noticed some weirdness on my fork steerer tube. The entire tube is completely smooth except for the bottom inch or so near the crown race, where it's slightly rippled or textured. You can feel it with your fingers.

Another weird thing: there's a spot of what looks like rust on the back of the fork steerer... looking inside the tube, there's a yellowish lump of something on the inside. After poking with a sharp thing, some of it flaked off into gold metallic specks.

What's going on? Does the rippling mean it was in a crash and isn't safe to ride? Please advise!