For the most part, many hand tools were perfected centuries ago. Since I am a blacksmith by trade, old tools interest me and the London pattern anvil is a good example of a design that was pretty much established by the 1700's. The two horn European anvil dates back even farther and remnants of fire tongs have been found in Norse graves dating to the first millennia AD. The problem with the really old stuff is damage from use and the elements. However, since most trades were passed down, sometimes a woodworker's treasure chest from a few hundred years ago can be found with planes, chisels, etc. Good luck on your hunt...