Yes all of the head styles from 1816 to 1857 can be called coronet heads because theall have the bust wearing a coronet with the word LIBERTY on it. But there are so many changes to the bust, and the early years are so different that the very broad Coronet is subdivided in the the still broad Matron head (middle dates) and the Braided hair (late dates) Even so there are half a dozen different head types in the middle dates and two in the late dates. 1839 is a transition year with five different head designs, four of them being Matron heads and one die being a braided hair. Then to add further confusion all of the pre-1836 matrons are open collar coins, while the 1836 to 39 matrons and all of the braided hair cents are close collar steam press coinage. Even then it isn't enough. If you really look at the styling you will see that the Matrons of the teens are different from those of the twenties, which are different from those of the early thirties, or mid to late thirties.