Compare to similar L'Enfant Necklace at $99,624: 

Georges L'Enfant Curb Link 18k Yellow Gold Necklace, 16.25 inches in length. Featuring alternating small polished links with oval twisted wire links representative of L'Enfant's most popular technique employed in his most recognizable designs. A very rare piece by the esteemed French jewelry maker. In very good condition and wear consistent with age. Circa 1960's with French eagle mark indicating 18k yellow gold and L'Enfant makers marks. 

"Lenfant’s name is known by vintage dealers and informed collectors, but it’s likely that some people who own Lenfant pieces don’t realize it, because for decades Georges Lenfant and his son, Jacques, collaborated on designs with almost every important jewelry house, from Cartier to Van Cleef & Arpels. The Lenfants’ hallmark, a diamond-shape stamp with the initials, appeared alongside the names of famous houses on jewelry and also was stamped on the gold bracelets of watches from Rolex, Hermès and Vacheron Constantin."

Newman, J. (2023, August 28). Obscurity May Be Ending for These Jewelry Designers. New York Times.