|BANJO - you can see the shape of the banjo saggar|
in this picture, bottom right
UPDATE - What is a MUFFIN?
Don't get confused! An American Muffin is a small domed spongy cake made with eggs and baking powder. An English Muffin is leavened bread, beloved by the English aristocracy particularly in the early 20th Century and served in a Muffin Dish.
A Muffin Dish should not be confused with the Muffin which is a small pottery plate measuring 5 or 6 inches in diameter. So Banjos were for small pottery plates.