Reply To: Chair construction

In a chair like that I would expect that each side of the rear seat frame is set into the rear legs with a half-blind housing, reinforced with a very large screw, laterally through the leg, horizontally into the seat frame. The screw-head would then be recessed slightly and disguised with a wooden plug.
I think that the darker wooden plug is shown in the final photo, IMG_3467.jpg

Some years ago Paul Sellers made a rocking chair project video on this site and the arms were fixed to the back posts in the same way….. large screw and a plug