W.R. Harvey & Co. (Antiques) Ltd has dated this piece to the 19th Century.
A stylish Pair of William IV Period Oak Hall Chairs in the Gothic Manner with carved trefoil details to the arched backs and flanking uprights, the shaped solid seats raised on octagonal tapered front legs.

Circa 1835
Price :£ 2,750-00p.
Height:36.5”,93 cms, Width:18”,46 cms, Depth:18”,46 cms.
(plates 154 to 172) Amongst these were several by AWN Pugin (1812-1852) whose influence during the first half of the 19th. Century was immense. Indeed it was Ackermann who published a book of Pugin’s Gothic Furniture being an assembly of many of the Gothic pieces illustrated in the Repository. Much Gothic furniture is described as “Puginesque” in homage to him.
https://en.wikipedia.org/wiki/Augustus_Pugin
W.R. Harvey & Co. (Antiques) Ltd has dated this piece to the 19th Century.
Specialists in 17th-18th and early 19th century fine english furniture, art, clocks and other objets d'art
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