This rather awesome Windsor high chair is from Philadelphia c. 1790, and has a very old-looking green painted finish. It sold for $1,375 at Freeman's Pennsylvania Sale last month, so chances are you didn't buy it.
I was going to say you could re-create the look by laying down some kind of Martha Stewart distress painting on an Ikea Gulliver high chair, but I only just now realized it's been discontinued. Craiglist, I guess.
Nov 12, 2014, Lot 213 Green-painted bow-back Windsor high chair, est. $1,500-2,500, sold $1,375 including premium [freemansauction]