Yes, I found it. Jean Baptiste Francois is said to have succeeded Augustin Lahure who is dated 1886-1900. This means your set was made sometime after 1886.
I would need to see the other French marks to give better dating. The seller has not sent any other mark.
I would not pay more than his asking price of 1280 euros. If the information the dealer is representing is correct, the asking price is low. However, the pictures of the mark he sent are too blurred to read properly and he has not sent the quality guarantee mark. Even if this is plated silver, the asking price is OK.
Remember insurance and shipping costs can be high.
I cannot quote what those might be.
Please know one of my specialties is silver and has been for over 60 years.
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