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Mrs Brab 1866, this is known to be the wife of Brabazon Pottinger, because she also appears in the following photo.
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Left to right, Miss Sealey, Thornhill, Mrs Nicholetts, Spring, Alfred Pottinger, Mrs Brab Pottinger, - Mrs Sealy.
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Spring, Barton, Griffith, Mrs Canfield{?}, Brab Pottinger, Mrs Do., Mrs Dende, Jenner, Myers, Miss Faithful, Thornhill.
These photos come from a private collection originally put together by my great great grandfather Charles James Barton, Bombay Artillery, & Royal Artillery.
They were almost certainly taken in Karachi, where Captain Barton was stationed with his battery.