Lemon ball too good to be true?

[Ghumbs]

Thanks, that's a really good link. When I come across balls like these, it makes me doubt my doubts. Mine doesn't appear to be too far off of the examples below. Now obviously I'm going to be the most biased here, but does it basically come down to provenance on these since they aren't marked? Or are there certain attributes to look for other than condition like materials, techniques, etc?