This is one of many wheels we have that were produced by Rossig Educational Charts. It's ten inches in diameter and in good shape. It's old! Singapore was called "Straits Settlement" and Sri Lanka was called "Ceylon". Arabia's principal industry was grazing. Grazing!
I still think this would be an excellent educational tool. Think of all the class assignments you could come up with using this wheel.
Stay tuned! There are more Rossig wheels in your future!
NOTE: What appears to be a stain on the wheel is really just my shadow. Bad light, today.