If it's right side up in the pic, that's a serious loop at the lower left to start a lowercase b. It doesn't seem natural when writing a b. I would just start at the top, down, to the right, nothing on the le
What about a poorly formed X written quickly and they ran out of space.
It seems to make sense to start at the top, and if so it looks like the only direction to go is down and to the left making nthat small loop, then back to the right making the larger loop. Almost like a figure eight at the bottom.
The line appears thicker, so either the starting point, or went over twice.
Having trouble 'air' writing this shape.
Soak it with Evaporust, even if there isn't rust visible it brings out paint very well and doesn't remove it.