After a number of year of our use, some of the joints got loose and it was time to repair.
Nearby you can see the chair after repair. And tools involved.
Forensics: The front lintel had been broken before. I suspect that verticals had splayed enough to allow one of the dowels to break. Pulled back together by the repairer, a scrap of wood was nailed to prevent the splay. Long ago and far away, I learned that nailing oak (other than flooring) was futile. Similarly, the glue blocks in the corners were nailed, maybe more than once as attested by the collection of rusty bent nails in each.
About 3 hours and just a small number of hand tools.
Some “Antique Road Show” host of the future will tell then owner of this one, “Interesting, well made, several repairs, a pretty good chair. But not worth much”.