Thank you very much Ammo 2440. It's very fast and very kind.
Indeed, there are many "silver" on ebay sites.
I try to be careful. Your comments are very instructive. I have several "Hallmarked" but I was wary of iscription "Silver".
Good night.
Jean Paul.
PS: I live near Arras and Vimy is the explanation of my interest cap badges WWI.
Many Commonwealth soldiers died here. Respect.