Postby dognose » Fri Apr 09, 2021 9:37 am
I think the answer here is that a plain London-made tray, by a now unknown maker and assayed there in 1819, has been up-dated, probably at the request of their customer, by a Sheffield silversmith. The border, and likely the engraving, were likely have been added and I suspect the later Sheffield marks will be found on the border.
The problem is, no K·G/&Co. were registered with the Sheffield Assay Office. However, an earlier entry in the Sheffield registers is that of James Kirkby, Gregory & Co. (J·K/& Co) and I think it likely that your mark may be an un-registered version belonging to that firm. Although, in theory, un-registered marks should not have been used, their use does appear from time to time.
Please confirm/deny the location of the marks.
Trev.