This gun is about 4x too expensive but it is nice to look at!
LF 1997 is between 1853 and 1855, and that is after the death of Casimir in 1852.
So this case has been made by his wife and Eugène because in 1853-1854 he is still working with his mother. He is leaving the 37 rue vivienne in 1855/1856.
pour la date, je ne me prononcerais pas, car on peut voir le poinçon de St Etienne utilisé à partir de 1856 (normalement). Une fabrication avant cette date n’est donc pas incohérente.
t’a parfaitement raison, les lignes bougent…