Questions about My Belgian Fonson Sword.

[EugeneS66]

Hello folk, I have a Belgian sword, but I don't know exactly what year it is? And was this blade only used ceremonially or was it a blade used for combat? I discovered it in Vietnam, it's strange that it's a Belgian sword instead of a French one, although at first I mistook it for the French 1822 model. Did the French use Belgian swords in Indochina? I once saw someone else post a picture of a sword exactly like mine but older and found at the Somme. I don't know if its presence in Vietnam is because the French actually used it in Indochina or if it was brought into Vietnam somehow. Please give me information about it if you know, thank you.