Ken — Thinking along the same lines as yourself, I checked my books and cannot find any reference to a silver fineness of 9225. Some of these are instantly recognisable, like 925 (Sterling), 833 (Maria Theresa Thalers), and 93055 (Pieces of Eight). However, I've been unable to find the fineness figures for the silver component of either Old Sheffield Plate or Close Plate. Logic suggests a slightly lower fineness than Sterling so that such pieces did not inadvertantly get hallmarked, but it would have had to be close to the Sterling fineness so that it did not look too dissimilar in a mixed service. So 9225
might be the fineness for Old Sheffield Plate or Close Plate.
However, from what I can see of the number in your friend's photograph, it looks to me rather more like an English EPNS pattern number.
Incidentally, I've just finished reading that lovely book
Mother Without a Mask by Patricia Holton. It is interesting that even in the late 1970s, when organising the eldest son's new home, the ladies of the Arab hareem rejected tarnished Sterling silver in favour of nice bright items made by Arab metalbashers from Maria Theresa Thalers (high nickel content).
Bernard C.
