Mark variant 1

The left-to-right J, ampersand, R, and G forms retain the source arrangement and dark filled-stamp character without adding a cartouche.
Medium confidence comparison reconstruction.
Maker's mark comparison reference
Compare 1 source-linked mark variant recorded under J & R Griffin (Joseph & Richard Griffin) J & R Griffin Ltd (after 1913). These are reconstructions for comparison, not source photographs or authentication evidence.

The left-to-right J, ampersand, R, and G forms retain the source arrangement and dark filled-stamp character without adding a cartouche.
Medium 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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