Prometheus Antiques has dated this piece to the 1850s.
The carving to the crest rail and the apron is also quite colonial looking. The design has the look of early Portugeuse or English chairs from the late seventeenth and early eighteenth centuries, although I do think these chairs are nineteenth century.

The chairs are in great condition with a good faded colour and patina, the caning is good and strong. The pair make a great decorative statement and are very imposing, with a wonderful country house look. C.1850.
overall sizes in inches each:
22 wide
48 high
22 deep
Prometheus Antiques has dated this piece to the 1850s.
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