With coins, a collector opens up the world, for with each coin, they hold a piece of history and a small work of art in their hands; perhaps they are also aiming for an investment. Anyone who has discovered this hobby wants to deepen their knowledge quickly. Axel Gutjahr provides a thorough introduction to the world of numismatics: he offers insights into coin history and material science and addresses all practical aspects of building a collection and caring for coins. A small coin lexicon rounds off this informative book.