Jacob
What goes around comes around.
No splat but looks as if was upholstered - pin holes in rebate.That looks like a very old piece - possibly 17 th century. ? The back splat seems to be missing as well. I think its a job for hand tools only. I'd remove the old tenons and make new ones by hand. They should insert by at least 20 mm into the mortises. You can use hide glue to make life easier for the next restorer !
Exactly what I meant! Nice example, very carefully made and once it has acquired a mahogany shade of rust almost invisible. I have seen even more elaborate examples -blacksmiths with skills of orthopaedic surgeon!Thank you for your diagnosis and suggested remedy.
Unfortunately there isn’t enough wood to work with, to get a sufficiently stiff bracket that would be inconspicuous. The back is also upholstered.
Funnily enough, we do have a chair where the top corners have been solidly repaired with inconspicuous metal splints. It belonged to my late father-in-law, who was a big heavy person. I don’t know if my mother-in-law noticed the repair when she bought it. It also requires a difficult repair - to a cross piece in the back.View attachment 104034
If upholstered both sides couldn't you work a big bracket in to be covered by new upholstery?