The front has 2 raised "stops" and the back center has a round 1/2 protrusion that a screw with a black rubber collar fits into. (i would love it if somebody where tell me what that is for) marked on the bottom nevco, japan. I believe it is aluminum. Probably made around the 1950s-1960s.
Can be used as a plant stand, hot pad or hung on the wall or even maybe a door stop. Measures 9" long x 5 1/8" wide. Weighs just over 5 ounces. This item is made of metal.