Maker's mark comparison reference
Compare 1 source-linked mark variant recorded under Sheffield. These are reconstructions for comparison, not source photographs or authentication evidence.
One thick open circular or omega-like import device centered inside one small rounded-square punch boundary; retain the lower opening or irregularity and do not regularize it into a perfect letter O.
Low confidence comparison reconstruction.
Maker labels and date or location statements follow the cited source records. Similar names across source collections have not been merged. Compare the photographed mark and the complete object before relying on a resemblance.
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