This is an interesting "Route Marker" Kit of paper signs for a Federal Convoy. Time frame is uncertain, but based in age I would say 50's-60's. I really can't find any documentation on Federal Convoys or how these signs were used. I found an obscure reference to a Federal Convoy transporting a Nuclear Warhead, and a few references to prisoner transfers via Federal Convoy.

Last photo taken with a yellow sheet of 8 1/2x11 paper gives you an idea of the size. I can practically guarantee you will be the only one in your collecting circle with a set of Federal Convoy Route Markers.