Could be a Masonic pyramid. On the other hand, sometimes a triangle is just a triangle!
It looks, from the puttied-up holes beneath the hinges, like it may have had leather straps around it at one time. That made me think of a...
As James C. has said, you have a nineteenth century "fancy chair", and a real bargain! They were super popular in the 1820s and '30s, and even...
It looks like a rustic, splint-seat version of the "corner chairs" that were popular in the 18th century with gentlemen who liked to spread their...
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