These are early post war 1950's/60's Erdal shoe polish tins. The graphics are great for WWII (on war-time tins the frog is not smiling). We only have red-brown color shoe polish, but you could glue a piece of piece of paper over the color to re-label it "schwarz" if you like. I have seen this before on war-time cans. The tins still have shoe polish inside, although it is rather dried out. You could replace it with black polish also and use it at events.
They are in good condition overall, but several do have dents. Price is for one. The tin measures 2 1/2" across.