From a technical perspective, any wooden chair whose legs, back and arms (if existent) emanate from a solid seat is a Windsor chair.
Here then is a pair of fruitwood Windsor chairs that are coming up for auction in Christie’s The English Collector: English Furniture, Clocks, European Ceramics & Portrait Miniatures in King Street, London on the 19th of May 2016.
Lot 74; a pair of George II fruitwood open armchairs, circa 1740, estimate £20,000 – £30,000. (Christie’s)
These solidly constructed ‘Hartwell chairs’ crop up periodically (see Christie’s Lot Notes) and normally attract high prices.
I blogged about a comparable Windsor chair in the Victoria & Albert Museum.
Jack Plane
Pegs and 'Tails 
How are the front legs attached Jack?
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I surmise you have noticed the anomaly at the front left corner of the seat of the nearest chair. I don’t know what’s happened there – perhaps a split and repair.
The front legs normally have a turned tenon which is inserted into a corresponding hole in the seat. Alternatively, a spigot is inserted into both the leg and seat.
JP
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Would it be correct to refer to these chairs as Queen Ann as well? I’m not sure if that refers to an era or style.
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As ascribed in the caption above, the chairs were made circa 1740, originating during the reign of George II (1727-60), so it would be incorrect and inappropriate to label them ‘Queen Anne’.
Anne was, by the Grace of God, Queen of Great Britain, France and Ireland, Defender of the Faith, etc. who reigned from 1702-14 – an era.
Contrary to popular North American belief, Thomas Chippendale (1718-79) was an English cabinetmaker and designer (not a British monarch) who worked in the rococo, Gothic and neoclassical styles. As a result, stuff broadly labelled as ‘Chippendale’ is frequently unhelpful and inaccurate.
JP
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