Which smithes signed using only an Aoi Mon

[TheGermanBastard]

I wonder which smithes would only use a bare Aoi Mon as a mean to sign?

[ChrisW]

By no means an expert, but doesn't the rust inside the sign sort of serve as a tip off? Its also VERY crisp and I can't discern chisel marks.

[Surfson]

Yasutsugu comes to mind when seeing that mon, but no idea whether they ever used it by itself.

 

 I agree with the concern that fresh rust inside the carving, just as fresh rust inside a signature, is a sign that it was recently done.

[Dave R]

Can we see the whole blade and the mounts please.