Mark variant 1

The two capital letters remain in the observed left-to-right order within the single rectangular cartouche, including the visible interior counters.
Medium confidence comparison reconstruction.
Maker's mark comparison reference
Compare 1 source-linked mark variant recorded under Alexander Osborne. These are reconstructions for comparison, not source photographs or authentication evidence.

The two capital letters remain in the observed left-to-right order within the single rectangular cartouche, including the visible interior counters.
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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