French in my opinion....for more information I can't help you right now, sorry. But "Mle 1935" is typical for French ammunition, probaly the type of detonator.
This box would have held HE/fragmentation shells for a French 60mm Modele 35 mortar. Nearly 5000 of these were in service with the French Army in 1940 ; the Germans captured many and called them 6cm Granatenwerfer 225(f). The design was used by the US as the 60mm Mortar M1.
Thanks for the quick answer Now I could selectively search Have even found a picture of the kiste/box ---> the last pic Axis History Forum • View topic - captured French mortars GrW.203(f), GrW.225(f), GrW.278(f)
Yes I confirm the 6cm Mortar . Not certain, but I think Mle = Millesime which means the year it was made. You see this on some Champagne bottles too. Not certain about the F.A. either : possibly it is the name of the manufacturer of simply the words "Fabrication" and "Année".
I believe that the 'F.A' denotes the type of shell, but I'm not aware of the actual wording indicated by the letters.....
could F be fragmentation? I think this is worth a phone call to one of my veteran friends. Maybe some of them may know.