This mark is not shown in the section of 19th century Orléans makers by Stéphanie Saulnier in Orfèvres d’Orléans (Paris: Somogy, 2003). However, the original copper registry plate of Orléans makers does not appear to have survived, and the photographic marks illustrated there are identified mostly by deduction.
That said, Saulnier does list a maker, Jérôme Letellier at 29 rue de la Faverie and later 15 coin Maugas, listed from 1796 to 1825 in Orléans almanacs and other references, noting that he married "a Boulaire".
Checking the Orléans état civil, I found the following, and I have no doubt that he is your man:
Pierre Jérôme Letellier, silversmith
Born: ca. 1766, Compiegne, Oise, son of Robert Jacques Letellier & Marie Catherine Boulanger
Married: 19 Feb 1794, Orléans, Loiret, to Marie Magdeleine Bohaire/Beauhaire (b. Artenay, Loiret ca. 1770) daughter of Jacques Bohaire & Magdeleine Germani
There were four children of the couple born in Orléans from 1795 to 1802. One of these – daughter Modeste – died in 1823, and I found one more almanac listing for Letellier in 1827. Thereafter the entire family drops from the record in Orléans. Letellier would have been 61 in 1827, a suitable age for him to retire and move to the country.
Hope this helps!