Primarily Petroliana Shop Talk Forums Shop Talk Petroliana Forums Known & Suspected Unmarked Petro Reproductions an altered US-66 shield on eBay

item number is 320683626907

this is a genuine Oklahoma DOT article, used between about 1975 and 1984... but it was once a route 64, and got modified by taking off one riveted-on digit and applying another.

note on the back the extra rivet holes, which clearly spell out a "4".