Paris, France, 1899-1965. Known originally as the Société Industriel de Ferblanterie, the firm underwent a name change to J de P in 1928, its contemporary came about in 1932.
Lithographed, tin, clockwork toy automobiles, motorcycles, aircraft and other motor miniatures. JEP cars traditionally carried a trademark on the radiator of the particular vehicle replicated.
What's it worth? Take a look at this Jep price guide: sold listings for a value indication.