The marks is that of:
Etienne Antoine Courtellemont
Born: 19 Aug 1795 [23 fructidor an III], St. Saveur sur Ecole, Seine et Marne, son of Simon Spire Courtellemont & Marguerite Angelique LeBetz
Married: 3 Nov 1835, Paris, to Marie Anne Cecille, daughter of Jean Louis Cecille & Jeanne Dauger
Died: 10 Mar 1886, Paris
It was registered at 5 rue de Harlay on 11 Apr 1834, and cancelled on 8 Oct 1840; he was a maker of silver hollowware. As he lived over 40 years after the mark was cancelled and was only 45 at the time, I believe he must have gone in to some other trade, but I found no reference to what that might have been. He and his wife had three daughters.
See Arminjon I:00446 [Note: Arminjon gives his name as "Antoine Etienne", but both his birth and death certificate say "Etienne Antoine"]