Hi there,
Weirdly enough, I also found the "F&S" makers mark on a Silver hallmarked button, which I think is a Police button. See Scans. You can also see that the button is also stamped with the more usual button backmark of "FIRMIN LONDON" and the hallmark has been apllied over the top of this.
I think from the hallmark that it is from Birmingham 1947. The KC also help dates it to pre 1952.
So "F&S" is reasonably recent but still at least 63years old.
Cheers
Ian
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