"Arquebus Key With Powder Flask "
This very rare and elegant powder flask opens by pressing on the mother-spring which detaches from it, it has a double transverse winding arquebus key, a movable ring on which there must have been a suspension ring n then it is nicely faceted and ends in cut iron with an openwork and a screwdriver. 
Le Magazine de PROANTIC
TRÉSORS Magazine
Rivista Artiquariato