Possibly
Johann Zeidler
Moss agate, gilded silver mounts, and enamel on copper overlay with rubies, garnets, emeralds, sapphires, citrine, and turquoise
mid 1600s
Possibly
Henri Toutin
goldsmith and enameler
Nicolas Bernard
watchmaker
Enamel on gold with steel, blued steel, and gilded brass
mid 1600s