As for your first author, yak. Look what happens when comparing the signatures (see 1). In the signature on your picture between the "VA" and "R" placed only two letters of the same size, even for the "I" there is no room. Also, this Vanier-Abramovich signed without the middle initial "S.": see 2 and 3 (this is like yours, but more, there is a signature can be seen better). So, apparently, you do not have Simon Claude Vanier, alas ...
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