https://commercialtype.com/catalog/lejeune/lejeune_hairline

Le Jeune Hairline is intended for the largest display sizes, 100 point and above, where its delicate hairlines can best express their extreme elegance.  This family is based primarily on the showings in the famed broadsheet specimen Molé Le Jeune produced in 1819. Molé’s foundry was bought out by E. Tarbé around 1834, who also acquired the Firmin Didot & fils foundry around 1837 and later renamed the operation the ‘Fonderie générale’. By the 1910s Molé’s punches had ended up in the hands of the Peignot & fils typefoundry, who kept his types available, though they were incorrectly labelled as “Didot”.  In both roman and italic, Le Jeune is characterized by crispness and beauty. Though its vertical proportions and ball terminals differ significantly from Le Jeune’s model, the spirit of the original comes through in the grace of the romans and the exuberance of the italics.