It was listed by Jeckyll & Co. Sold pieces stay on Sellingantiques as a record of what has passed through, and the next one is rarely far away.
Jeckyll & Co has dated these Mahogany Clam Shell Chairs to the 1910s.

Good condition throughout with hand-worked gros-point tapestry seats
Further Reading: Lindsay Macbeth 'The Wheelers of Arncroach. A Family of Furniture Makers, Regional Furniture, 1991 Volume V. A Clam shell chair is illustrated on p73, figure 9
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Jeckyll & Co has dated these Mahogany Clam Shell Chairs to the 1910s.
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You can view the stock and full dealer information on the Jeckyll & Co Profile Page