When you click on a category, you will get a overview of the coins.
Do you click on the coin, you will get a large picture with the explanation.
Dating: Roman Empire = app. 750 BC - 476 AD Carolingian Empire = 751-987 Middle Medieval = app. 1001-1300 Late Medieval = app. 1301-1499 16th and 17th Century = 1500-1699 18th Century and later = 1700 and later