Search:

The place I've gotten all my replacement scales is The Superior Shave. They're consistently in stock there, which gives him a leg up on just about everyone else. Good luck with that blade. Keep it...

The location, and the way it looks airbrushed. There's such a smooth gradient of rustiness.

And yes, that does look like a levitating brush. But that's an issue for its own thread :)

If this is a vintage blade in old scales, you might have celluloid rot going on. Look between the scales where your rust spot is, and see if there's any pitting in them. They could be gassing off...