Granite Ware Enamel on Steel 4-Quart Bean/Stock Pot with lid, Speckled Black

Hello, Do you happen to know where this pot was made? Thanks!

So the dimensions given above say 10.6 x 8.6 x 6 inches. Is the 10.6 the width with the handle, 8.6 without the handle and the 6" the bottom width?

Can this be used to cook on a charcoal grill?

Why do they say not to use on glass top stoves.