Theophilus Martin was a silversmith from France who designed and manufactured high quality silverplated and gilded base metal mountings used on pump atomizers. He seems to have operated around 1904 and possibly up until around 1920.
His mark is "TM" with an image of a piston pump style atomizer in the middle. I believe he may have registered his atomizer hardware designs in France, but I would need someone who lives in France to do a little digging for us to see if this is true. I do not believe he was granted any patents for his designs as I have not seen any mountings marked "SGDG" or "brevete".
You can find Martin mounts on luxurious art glass bottles by Galle, Daum Nancy and possibly Baccarat and Saint-Louis. His chased designs on the mountings contribute much of the aesthetic appeal of these already valuable crystal treasures.
I think he may have been the founder of the jewelry company T. Martin & Co, who worked out of France and London around 1900-1930, most famous for their watches.