John Siudmark Asian Art also has a Buddhist plaque from either ‘Bihar [in India] or Burma[/Myanmar]‘.
Who acquired this, when, where and how? There are far more questions than answers.
Now, instead of “half” a findspot, there are two. Is that a product of ignorance or obfuscation? Does the seller not know, or does the seller not want to say?
Again, how can any buyer have confidence in the seller and the source of the antiquity?