Several things in that note raise serious questions....one is speaking in the present tense and two they never stopped making roses because of technical issues and while I don't know how many were made, I am certain more than one hundred were made. I think the weight could be by several other makers, just not St. Clair.
As I read the excerpt it sounds like something out of Jean Melvin's book......I'll have to look.
Looked, indeed those notes are from the book, the roses went on to be conquered. The colored canes comment is exactly that, not millefiori canes, just colored canes. Could we be looking at the signature all wrong??