Ford and Jean ( both seriously to ben taken as "enough" knowledgeable into metallurgical sciences... )- did already point out about the thematics....
i think, so far there is no one professional metallurgist out here, - this all thematics should start- AND END- with Ford´s excellent written words.
and,- as far NBTHK does not answer to our´s collectors regularely happening questions, a proof and academic authentification about this "mystrere"....is eitherway obsolete.
Christian