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Maker's Mark (J.M.J.): Appears to be the sponsor's or silversmith's initials, which has been recorded on 19th-century Scottish and British provincial silver pieces (such as sauce ladles assayed in Glasgow c1881

Scottish silver flatware ladle
Maker: John Muir Junior
Assay office: Glasgow
Maker’s mark: J.M.Jr / J.M.J.
Working period: 1849–1862