This chair, with its offset, turned back posts, is a very early banister back form probably made in or around Philadelphia. It appears that it was once part of a larger set of side chairs, which are all easily recognised as being "the same." In fact, they are quite separate in the turning details. Two from the set sold at Pook & Pook, Inc., Downingtown, Pennsylvania, Period Furniture, Fine Art, & Accessories, January 14, 2012, lot 40. A joined walnut armchair with a very similar crest purportedly made by Joseph Pennock (1677-1771) is in Primitive Hall (c. 1738), West Grove, Pennsylvania (see William Macpherson Hornor, Jr, Blue Book, Philadelphia furniture: William Penn to George Washington, (Philadelphia, PA: Hornor, 1935), pl 10). For other related joined armchairs see Joseph K Kindig III, The Philadelphia Chair: 1685-1785, (York, PA: The Historical Society of York County, 1978), no. 10 and Pook & Pook, Inc., Downingtown, Pennsylvania, Period Furniture, Fine Art, & Accessories, January 14, 2012, lot 40.