This product is an authentic 36x8 double-sided street sign for Alexander Drive. It is likely a collectible item due to its vintage nature and association with transportation.
Since 1945 most signs have been made from sheet aluminium with adhesive plastic coatings; these are normally retroreflective for nighttime and low-light visibility. Before the development of reflective plastics, reflectivity was provided by glass reflectors set into the lettering and symbols