A formal script cast on angled bodies [Schröder], issued by Deberny & Peignot in 1928. [Reichardt 2011] Accompanied by traits de plume (“pen strokes”) drawn by Alfred Latour. [specimen] It’s not clear if Latour worked on the letterforms, too.

Among digital fonts, OPTI Excelsior Script comes close, but doesn’t match a showing in a post-1950 specimen in all details.