René, very nice box and shotshells, thanks for sharing these nice pictures with us, as usual.
The designation “Gaupillat and Co.” may lead to the interpretation that this is “Gaupillat & Cie.”, but as far as I can deduct from ads and other references is that it was a “short” company name used by SFM when trading in London, also from this same address and as early as 1885. There are other shotshells labels associated to this address that for example read: “Gevelot, Gaupillat & Co. London E. C.” or “Gevelot & Co.”. Also, I don’t think that Gaupillat & Cie. was ever listed as a “Manufacturer of Sporting and Military Ammunition”.
Between 1875 and 1899 this was address of Pigou, Wilks and Laurence, a well know gunpowder manufacturer. Also, at contemporary times it was an address used by The Smokeless Powder Co. and The Explosives Company.
Ad from 1895: