This appears to be the mark and symbol of Alexandre Tortez, working in Paris at 94, rue du Temple from 1891-1898. Yours tongs were made for export of 950 standard silver as shown by the Mercury head mark used from 1878-1972. Hope this helps.
Hi Maurice, hi JayT! Thank you for your replies! I think the maker is really Alexandre Tortez. So, identification is successfully completed! Best regards. Alex.