Visited a couple antique stores yesterday on my way back to New Bern from Winston Salem. At the Antique Market Place in Greensboro, I bought an Upson Nut Company No.61 two foot folding rule. From an on-line search, this was a pretty common rule made sometime between 1854 and 1911 when the company closed. I cleaned mine a little with some mineral spirits today and started using it on my current project. I've not had a folding rule before except the modern six foot carpenter's rule. This is nicer for the smaller work that I do.