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Hi. I do have that PCA Bulletin, and George Kulles' book, and there is no doubt that the canes in your weight are very similar to some in Grenelle paperweights (I don't like to use the word 'identical'). Whether it is Grenelle rather than StM is hard to judge, as although authors try their best to be accurate, there is always some uncertainty with lesser known factories.
I collect any paperweight books I can find, as the older ones are often fascinating - though they are quite often misleading too (as they present speculative or 'received wisdom' material as 'established fact'). George Kulles, who is relatively modern, accepts that there are a few errors in his books - it is a fact of life that new information turns up, and old ideas have to be revisitedand revised.
Regarding the badge weight on frit, many are indeed Belgian rather than Paul Ysart - there is a thread on GMB that discusses some of the examples.
Alan