Colin Brand Antiques has dated this piece to the 1900s.
For centuries, these chairs were made on Orkney by and for Orcadians. In the absence of a great number of trees, they were made from a small amount of driftwood and large quantities of the straw.

In the late C19th, local carpenter David Munro Kirkness, a keen businessman, shipped examples of his chair to the port of Leith, where they were seen by buyers from Liberty of London, which led to a lucrative deal to distribute them world-wide. After the death of Kirkness in 1936, the chair making was taken over by fellow Orkney resident, Reynold Eunson in 1956, who continued the tradition until 1978.
Colin Brand Antiques has dated this piece to the 1900s.
Antiques with a story to tell and where history finds a home
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