The first mug I ever saw was on the Coronation of QEll, all we children were given one and a tea plate. I have no idea where mine might have gone.
I use side plates from which to eat my meals, they are 10" in diameter and the rim is 1" wide so the eating area is 8" and that is sufficient food for a meal for my appetite. I used to use large mugs for my tea but lately I seem to get stomach cramps after drinking it so, for the time being, I have stopped. I now have Pukka Three Ginger tea and various others by the same maker; they are all organic so, in theory, should be good for me.