Possibly the most recognizable and most famous prop second only to the Declaration of Independence: the Ocular Device.
I built this Ocular Device Prop Replica in 2011, with some enhancements in 2012.(First was some glass with non-permanent stained-glass material applied, with some rather flimsy springs, then I replaced them both with true-color stained glass and loupe springs.)
The glasses themselves, sans colored loupes, are modified Jas. Townsend and Son 18th Century Reproduction Glasses: http://www.townsends.us/18th-century-reproduction-glasses-gl791-p-166-157.html
