Lettres Annales (Date letters): control (proof) date stamped after manufacture (and not necessarily the year of manufacture.)



French lower case cursive
Les lettres de l'alphabet
https://www.youtube.com/watch?v=tJhCHQKUJzk



Controller's (inspector's) marks can not reliably be used to date a gun; they were re-used and the significance of many has been lost to a fire at Banc d'Epreuves de Liege . I believe PeteM posted the fire was in the 30s.